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Pennsylvania Railroad class T1

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increased wear and tear, particularly to the 100-mph-limited poppet valves. They were described as "free steaming," meaning they could generally maintain boiler pressure regardless of throttle setting. They were so powerful that violent wheel slip could occur over a wide speed range if the engineer did not handle the throttle carefully; loss of driver traction at high speeds, especially when the T1 was under heavy load while ascending grades, caused damage to the poppet valves. The Franklin Type A valve gear applied to the T1s was designed for continuous speeds at 100 mph, and sprints up to 125 mph. In interviews with historian William L. Withuhn in the 1970s, Franklin engineers Julius Kirchhof and Ray Delano both claimed a Franklin technician charged with determining the cause of frequent poppet valve failures on the T1s saw them operated at speeds of up to 100-110
709: 854: 40: 700:"spring equalization": The stiffnesses of the springs supporting the locomotive over the axles were not adjusted to properly equalize the wheel-to-track forces. The drivers were equalized together but not equalized with the engine truck. In the production fleet the PRR equalized the engine truck with the front engine and the trailing truck with the rear engine, which helped to solve the wheelslip problem. 960: 820:
between the PRR's own Altoona Works and Baldwin. On December 20, 1944, the PRR Board authorized the purchase of 50 Class T1 locomotives for $ 14,125,000 ($ 282,500 per unit, equal to $ 4,889,546 each today). Baldwin's chief designer, Ralph P. Johnson, was responsible for the mechanical aspects of the new T1 class. Designer
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obtained US Patent D 136,260 for an early T1 conceptual design with a high-mounted cab located over the forward driving set. While that suited Baldwin's objective of making the most distinctive steam locomotive possible, practical considerations led the T1 design to be revised to the conventional cab
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also increased the speed because they gave very accurately timed delivery of steam to the cylinders. However, there was a drawback of the metallurgy used; the poppet valve could not withstand the stress of sustained high-speed operation (meaning over 100 mph (160 km/h) on production T1s).
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began restoring a T1 using the original plans with subtle performance improvements where necessary. The T1 Trust's goal is to provide mainline excursion service. The T1 Trust's cost estimate to build T1 number 5550 is $ 10 million, with an expected completion date of 2030 (This total has since been
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The PRR ordered two Baldwin prototypes (Nos.  6110 and 6111) at a cost of $ 600,000 on June 26, 1940. Both prototypes had numerous teething problems and were prone to wheelslip if not handled carefully by the engineer, but favorable test reports resulted in a production order for 50 T1s, split
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An article appearing in a 2008 issue of the Pennsylvania Railroad Technical and Historical Society Magazine showed that inadequate training for engineers transitioning to the T1 may have led to excessive throttle applications, resulting in driver slippage. Another root cause of wheelslip was faulty
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Due to their complexity relative to other steam locomotive designs, the T1s were difficult to maintain. Designed to run reliably at speeds of up to 100 mph (160 km/h), the T1s were so powerful that they could easily exceed their designed load and speed limitations, which in turn caused
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until October 1940; therefore, its turning radius prohibited it from operating over most of the PRR network. The 6-4-4-6 design reduced driving set traction to the point that it was especially prone to wheel slip; thus only one Class S1 was built. The PRR returned to Baldwin to develop a duplex
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No. 6100 of 1939. It managed to reach 100.97 miles per hour (162.50 km/h) on level track while pulling a 1,350-ton passenger train. Its performance encouraged the PRR to continue to develop duplex steam locomotives. The S1 was built unnecessarily large for her exhibition at the
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K4s locomotives became the norm on many trains. The railroad had many locomotives available, but paying two crews on two locomotives per train was expensive. Meanwhile, other railroads were leaping ahead, developing increasingly powerful passenger train locomotives. Rival
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dynamometer car DM-1 while on loan to C&O. In 1944 no. 6110, tested on the stationary test plant in Altoona, developed 6,550 ihp (4,880 kW) in the cylinders at 85 mph (137 km/h). They also regularly racked up over 8,000 miles a month.
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Chesapeake & Ohio Tests the PRR T1 - Chesapeake and Ohio Historical Magazine, May 2005 by Stephenson, David R - The C&O test report contains information that is not widely known, and some of it contradicts generally accepted beliefs about the
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project. The first piece of the locomotive, the keystone-shaped number plate, was cast in April, 2014, followed by the first minor component, a driving spring link pin, in October, 2014. Major components completed as of March, 2019 include two
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could be drastically reduced. Given that the movement of the main rod could not be fully balanced, the duplex design would reduce the "hammer blow" on the track. The lower reciprocating mass meant that higher speeds could be achieved. Use of
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all first-class prime trains in 1948, most T1s were downgraded to haul secondary trains. Some of them were withdrawn from passenger service in 1949; all were out of service by 1952. They were scrapped between 1951 and 1956.
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on all express passenger trains, leaving unanswered questions as to whether the T1's flaws were solvable, especially taking into account that the two prototypes did not have the problems inherent to the production units.
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The PRR began to develop steam locomotives again in the mid-to-late 1930s, but with a difference. Where previous PRR locomotive policy had been conservative, new radical designs took hold. Designers from the
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The last production T1 (no. 5549) entered service on August 27, 1946. Engine no. 5539 developed 5,012 hp (3,737 kW), as tested between September 11, 1946, and September 14, 1946, by
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position with a slight modification of the unique nose design included in Loewy's patent. Raymonds distinctive design of the T1 heavily influenced other engines, most notably the
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However, the deficiencies of the K4s became more evident during the 1930s. The locomotives performed well, but as train lengths increased they proved to be underpowered;
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locomotives were produced in 1929, but they weren't considered enough of an improvement to be worthwhile. After that, the PRR's attention switched to
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of the T1 became the basis of the design. The 520 class construction pace was then increased to come out before the T1 to avoid patent claims.
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drivers, the prow, cab, third-course boiler and fire door. Front tube sheet construction was under way by a fabricator in St. Louis, Missouri.
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19.75 in Γ— 26 in (502 mm Γ— 660 mm), 18.75 in Γ— 26 in (476 mm Γ— 660 mm) (some)
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both when starting and at speed, in addition to being complicated to maintain and expensive to run. The PRR decided in 1948 to place
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No. 6110, the "sister" prototype of class T1 prototype No. 6111. Its streamlined casing was designed by renowned industrial designer
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mph to make up time with short trains of six or seven cars, determining the speed by timing when the train passed mileposts.
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reduced to a bit more than $ 7 million, as a used PRR long haul tender has been acquired in lieu of new construction).
2568: 2431: 2416: 2156: 1243: 846: 830: 2161: 1996: 1946: 1941: 1936: 1931: 1926: 1921: 1916: 1911: 1906: 1901: 1861: 1856: 1851: 1846: 1786: 1781: 1776: 1771: 1766: 1761: 1756: 1751: 1746: 1741: 1736: 1731: 1726: 1721: 1716: 1711: 1706: 1686: 1681: 1676: 1671: 1606: 1601: 1596: 2136: 2131: 2042: 2037: 2032: 2027: 2022: 1991: 1981: 1971: 1966: 1896: 1891: 1886: 1831: 1826: 1821: 1666: 1661: 1566: 1561: 1551: 1546: 1541: 1536: 1506: 1496: 923: 888: 649: 1154:"Pennsy T1 comeback? Ten questions and answers for the T1 Trust", Volume 75, Number 5, Trains Magazine, May 2015. 708: 1435: 979: 902: 782: 87: 1406: 1294: 766: 2593: 853: 790: 1458: 793:, but the duplex used one rigid frame. In a duplex design cylinders could be smaller, and the weight of 663: 572: 479: 469: 688: 747: 1802: 579: 546: 1131: 901:
The construction of 5550 is also following construction and financing methods pioneered by the
1373: 1262: 833:'s chief engineer Frank Hugh Harrison saw the T1 in an american magazine whilst designing the 786: 726: 692: 670: 759: 676: 39: 1424:- At 3 minutes and 15 seconds, an example of the T1's infamous wheel slip can be observed. 743: 536: 303: 734:
Before the T1, the last production express passenger engine the PRR had produced was the
1166:"Chronology of the Pennsylvania Railroad Company its Predecessors and Successors - 1940" 1165: 754: 230: 155: 2542: 1366: 1327: 965: 875: 821: 713: 684: 219: 209: 82: 72: 1427: 1368:
Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900-1957
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64,653 lbf (287.6 kN) (85%), 58,271 lbf (259.2 kN) (85%) (some)
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YouTube video displaying the operation of T1's on the Pennsylvania Railroad
1092:"Pennsylvania 4-4-4-4, 6-4-4-6, etc. "Duplex Drive" Locomotives of the USA" 1040:. The Pennsylvania Railroad T1 Steam Locomotive Trust. 2016. Archived from 794: 724:
A T1 prototype leaving Chicago's Union Station in February 1943 with the
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19,200 US gal (73,000 L; 16,000 imp gal)
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Lemony Snicket's A Series of Unfortunate Events - Train Scene
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American Steam Locomotives: Design and Development, 1880–1960
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Rivanna Chapter, National Railway Historical Society (2005).
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of 1914, produced until 1928. Two experimental enlarged
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Indiana University Press. pp. 361–386. 1443: 1244:"Pennsylvania Railroad 4-4-4-4 T1 Locomotive" 608:Western Pennsylvania, Ohio, Indiana, Illinois 8: 1132:"Spring Equalization for Steam Locomotives" 1032: 1030: 1028: 1026: 1024: 1022: 349:180 P 76 (Prototype), 180 P 84 (Production) 2278: 2008: 1477: 1470: 1450: 1436: 1428: 1190:"Streamlimed Locomotives of the Swing Era" 943:, which in turn a televised adaptation of 926:version of a T1 was seen in the 2004 film 560: 511: 136: 50: 1212:"This Month in Railroad History: August" 769:, while other roads developed passenger 283:6111: 15 ft 6 in (4.72 m) 1085: 1083: 1013: 1001: 991: 648:All 52 original scrapped, 1 new build ( 2579:Steam locomotives of the United States 1387:Loco Profile 24: Pennsylvania Duplexii 592:52 original, plus 1 under construction 29: 27:Class of 52 4-4-4-4 duplex locomotives 1130:Kerr, Douglas A. (October 16, 2011). 893:In 2014, a non-profit group known as 7: 1257:Withuhn, William L. (1 March 2019). 1230: 1074: 1062: 941:Thomas The Tank Engine & Friends 937:Thomas & Friends: All Engines Go 464:1,430 sq ft (132.9 m) 439:5,639 sq ft (523.9 m) 431:4,209 sq ft (391.0 m) 245:107 ft 0 in (32.61 m) 974:South Australian Railways 520 class 827:South Australian Railways 520 class 816:design fit for series production. 687:. However, they were also prone to 275:11 ft 1 in (3.38 m) 25: 2564:Pennsylvania Railroad locomotives 2441:Articulated electric locomotives: 1407:Photos of PRR 4-4-4-4 locomotives 423:490 sq ft (45.5 m) 958: 38: 1090:Llanso, Steve; Duley, Richard. 837:. Frank was impressed, and the 407:300 lbf/in (2.07 MPa) 391:92 sq ft (8.5 m) 328:197,400 lb (89.54 t); 2400:Articulated steam locomotives: 1320:"Latest News (March 24, 2019)" 874:When the PRR Board decided to 531:6,500 ihp (4,800 kW) 341:944,700 lb (428.5 t) 333:442,500 lb (200.7 t) 317:502,200 lb (227.8 t) 309:279,910 lb (127.0 t) 1: 2559:Streamlined steam locomotives 367:85,200 lb (38.65 t) 1038:"FAQ Section - The T1 Trust" 428: β€’ Tubes and flues 847:Chesapeake and Ohio Railway 831:Islington Railway Workshops 600:6110, 6111, 5500-5549, 5550 399:100 in (2,540 mm) 293:71,680 lb (32.51  105:BLW 72764–72788 (5525–5519) 2610: 1364:Staufer, Alvin F. (1962). 889:Pennsylvania Railroad 5550 886: 813:1939 New York World's Fair 436: β€’ Total surface 235:42 in (1,067 mm) 225:80 in (2,032 mm) 1468: 1385:Reed, Brian (June 1972). 559: 510: 461: β€’ Heating area 135: 49: 37: 980:LNER Peppercorn Class A1 903:LNER Peppercorn Class A1 783:Baldwin Locomotive Works 214:36 in (914 mm) 88:Baldwin Locomotive Works 33:Pennsylvania Railroad T1 1389:. Profile Publications. 791:articulated locomotives 388: β€’ Grate area 267: in (37.43 m) 858: 746:and the production of 731: 717: 90:(5525–5549, 6110–6111) 2574:Passenger locomotives 1459:Pennsylvania Railroad 1164:Baer, Christopher T. 856: 723: 711: 664:Pennsylvania Railroad 573:Pennsylvania Railroad 2584:Scrapped locomotives 1291:Railfan and Railroad 748:electric locomotives 652:) under construction 420: β€’ Firebox 2554:4-4-4-4 locomotives 2549:Baldwin locomotives 1096:SteamLocomotive.com 515:Performance figures 117:2014–present (5550) 115:1945–46 (5500–5549) 44:T1 5549 on display. 2569:Duplex locomotives 1474:    1330:on August 24, 2019 945:The Railway Series 924:computer-generated 859: 795:side and main rods 732: 718: 693:diesel locomotives 523:120 mph (193 km/h) 2536: 2535: 2531: 2530: 2527: 2526: 2275: 2274: 2005: 2004: 1300:on March 17, 2016 1044:on 24 August 2019 787:duplex locomotive 727:Manhattan Limited 677:steam locomotives 660: 659: 656: 655: 555: 554: 506: 505: 453: β€’ Type 131: 130: 103:Altoona 4560–4584 16:(Redirected from 2601: 2279: 2009: 1478: 1471: 1452: 1445: 1438: 1429: 1390: 1381: 1371: 1351: 1346: 1340: 1339: 1337: 1335: 1326:. Archived from 1316: 1310: 1309: 1307: 1305: 1299: 1288: 1279: 1273: 1272: 1254: 1248: 1247: 1240: 1234: 1228: 1222: 1221: 1219: 1218: 1207: 1201: 1200: 1198: 1196: 1186: 1180: 1179: 1177: 1175: 1170: 1161: 1155: 1152: 1146: 1145: 1143: 1141: 1136: 1127: 1121: 1118: 1112: 1111: 1109: 1107: 1102:on 27 April 2017 1098:. Archived from 1087: 1078: 1072: 1066: 1060: 1054: 1053: 1051: 1049: 1034: 1017: 1011: 1005: 999: 968: 963: 962: 939:, a spin-off of 865: 773:" type and then 760:New York Central 561: 512: 412:Heating surface: 306: 266: 265: 261: 258: 203: 199: 197: 196: 192: 189: 137: 124: 113:1942 (6110–6111) 70:Ralph P. Johnson 51: 42: 30: 21: 2609: 2608: 2604: 2603: 2602: 2600: 2599: 2598: 2539: 2538: 2537: 2532: 2523: 2492: 2436: 2395: 2375: 2346: 2326: 2297: 2271: 2251: 2226: 2206: 2171: 2116: 2087: 2067: 2001: 1951: 1871: 1796: 1611: 1576: 1516: 1464: 1456: 1397: 1384: 1363: 1360: 1358:Further reading 1355: 1354: 1347: 1343: 1333: 1331: 1318: 1317: 1313: 1303: 1301: 1297: 1286: 1281: 1280: 1276: 1269: 1256: 1255: 1251: 1246:. 20 June 2020. 1242: 1241: 1237: 1229: 1225: 1216: 1214: 1209: 1208: 1204: 1194: 1192: 1188: 1187: 1183: 1173: 1171: 1168: 1163: 1162: 1158: 1153: 1149: 1139: 1137: 1134: 1129: 1128: 1124: 1119: 1115: 1105: 1103: 1089: 1088: 1081: 1073: 1069: 1061: 1057: 1047: 1045: 1036: 1035: 1020: 1012: 1008: 1000: 993: 988: 964: 957: 954: 919: 891: 885: 872: 863: 829:. In late 1942 775:4-8-4 "Northern 771:4-8-2 "Mountain 744:electrification 706: 589:Number in class 537:Tractive effort 494:Franklin poppet 445: 404:Boiler pressure 329: 304:Adhesive weight 302: 263: 259: 256: 254: 201: 194: 190: 187: 185: 184:4 ft  183: 146: 122: 116: 114: 104: 91: 86: 71: 54:Type and origin 45: 28: 23: 22: 15: 12: 11: 5: 2607: 2605: 2597: 2596: 2591: 2586: 2581: 2576: 2571: 2566: 2561: 2556: 2551: 2541: 2540: 2534: 2533: 2529: 2528: 2525: 2524: 2522: 2521: 2516: 2511: 2506: 2500: 2498: 2494: 2493: 2491: 2490: 2485: 2480: 2475: 2470: 2465: 2460: 2455: 2450: 2444: 2442: 2438: 2437: 2435: 2434: 2429: 2424: 2419: 2414: 2409: 2403: 2401: 2397: 2396: 2394: 2393: 2387: 2385: 2377: 2376: 2374: 2373: 2368: 2362: 2360: 2348: 2347: 2345: 2344: 2338: 2336: 2328: 2327: 2325: 2324: 2319: 2313: 2311: 2299: 2298: 2296: 2295: 2289: 2287: 2276: 2273: 2272: 2270: 2269: 2263: 2261: 2253: 2252: 2250: 2249: 2244: 2238: 2236: 2228: 2227: 2225: 2224: 2218: 2216: 2208: 2207: 2205: 2204: 2199: 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384: 381: 377: 376: 373: 369: 368: 365: 361: 360: 355: 351: 350: 347: 343: 342: 339: 335: 334: 323: 319: 318: 315: 311: 310: 307: 299: 298: 291: 285: 284: 281: 277: 276: 273: 269: 268: 251: 247: 246: 243: 237: 236: 233: 227: 226: 223: 216: 215: 212: 206: 205: 181: 175: 174: 171: 164: 163: 158: 151: 150: 147: 145:Configuration: 142: 141: 140:Specifications 133: 132: 129: 128: 125: 123:Total produced 119: 118: 111: 107: 106: 101: 97: 96: 80: 76: 75: 68: 64: 63: 60: 56: 55: 47: 46: 43: 35: 34: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2606: 2595: 2594:Raymond Loewy 2592: 2590: 2587: 2585: 2582: 2580: 2577: 2575: 2572: 2570: 2567: 2565: 2562: 2560: 2557: 2555: 2552: 2550: 2547: 2546: 2544: 2520: 2517: 2515: 2512: 2510: 2507: 2505: 2502: 2501: 2499: 2497:Non-standard: 2495: 2489: 2486: 2484: 2481: 2479: 2476: 2474: 2471: 2469: 2466: 2464: 2461: 2459: 2456: 2454: 2451: 2449: 2446: 2445: 2443: 2439: 2433: 2430: 2428: 2425: 2423: 2420: 2418: 2415: 2413: 2410: 2408: 2405: 2404: 2402: 2398: 2392: 2389: 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1890: 1888: 1885: 1884: 1882: 1879: 1874: 1868: 1865: 1863: 1860: 1858: 1855: 1853: 1850: 1848: 1845: 1843: 1840: 1838: 1835: 1833: 1830: 1828: 1825: 1823: 1820: 1818: 1815: 1813: 1810: 1809: 1807: 1804: 1799: 1793: 1790: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1770: 1768: 1765: 1763: 1760: 1758: 1755: 1753: 1750: 1748: 1745: 1743: 1740: 1738: 1735: 1733: 1730: 1728: 1725: 1723: 1720: 1718: 1715: 1713: 1710: 1708: 1705: 1703: 1700: 1698: 1695: 1693: 1690: 1688: 1685: 1683: 1680: 1678: 1675: 1673: 1670: 1668: 1665: 1663: 1660: 1658: 1655: 1653: 1650: 1648: 1645: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 1624: 1622: 1619: 1614: 1608: 1605: 1603: 1600: 1598: 1595: 1593: 1590: 1589: 1587: 1584: 1579: 1573: 1570: 1568: 1565: 1563: 1560: 1558: 1555: 1553: 1550: 1548: 1545: 1543: 1540: 1538: 1535: 1533: 1530: 1529: 1527: 1524: 1519: 1513: 1510: 1508: 1505: 1503: 1500: 1498: 1495: 1493: 1490: 1489: 1487: 1484: 1479: 1476: 1473: 1472: 1467: 1463: 1460: 1453: 1448: 1446: 1441: 1439: 1434: 1433: 1430: 1423: 1420: 1418: 1415: 1413: 1410: 1408: 1405: 1403: 1399: 1398: 1394: 1388: 1383: 1379: 1375: 1370: 1369: 1362: 1361: 1357: 1350: 1345: 1342: 1329: 1325: 1321: 1315: 1312: 1296: 1292: 1285: 1278: 1275: 1270: 1264: 1260: 1253: 1250: 1245: 1239: 1236: 1232: 1227: 1224: 1213: 1206: 1203: 1191: 1185: 1182: 1167: 1160: 1157: 1151: 1148: 1133: 1126: 1123: 1117: 1114: 1101: 1097: 1093: 1086: 1084: 1080: 1076: 1071: 1068: 1064: 1059: 1056: 1043: 1039: 1033: 1031: 1029: 1027: 1025: 1023: 1019: 1015: 1010: 1007: 1003: 998: 996: 992: 985: 981: 978: 975: 972: 971: 967: 966:Trains portal 961: 956: 951: 946: 942: 938: 934: 931: 930: 925: 921: 920: 916: 914: 912: 907: 906:60163 Tornado 904: 899: 896: 890: 882: 880: 877: 869: 867: 855: 851: 848: 842: 840: 836: 832: 828: 823: 822:Raymond Loewy 817: 814: 809: 804: 801: 800:poppet valves 796: 792: 788: 784: 778: 776: 772: 768: 765: 761: 756: 755:double-headed 751: 749: 745: 741: 737: 729: 728: 722: 715: 714:Raymond Loewy 710: 703: 701: 697: 694: 690: 686: 685:Raymond Loewy 682: 678: 675: 672: 669: 665: 651: 647: 643: 639: 635: 631: 627: 623: 619: 615: 611: 607: 603: 599: 595: 591: 587: 583: 581: 577: 574: 571: 567: 562: 558: 550: 548: 544: 540: 538: 534: 530: 526: 522: 520:Maximum speed 518: 513: 509: 502:Poppet valves 501: 497: 493: 491: 487: 483: 481: 480:Cylinder size 477: 473: 471: 467: 463: 459: 455: 451: 447: 442: 438: 434: 430: 426: 422: 418: 414: 410: 406: 402: 398: 394: 390: 386: 382: 378: 374: 370: 366: 364:Fuel capacity 362: 359: 356: 352: 348: 344: 340: 336: 332: 327: 324: 322:Tender weight 320: 316: 312: 308: 305: 300: 296: 292: 290: 286: 282: 278: 274: 270: 252: 248: 244: 242: 238: 234: 232: 231:Trailing dia. 228: 224: 221: 217: 213: 211: 207: 202:1,435 mm 182: 180: 176: 172: 170: 167: β€’  165: 162: 159: 157: 154: β€’  152: 148: 143: 138: 134: 126: 120: 112: 108: 102: 100:Serial number 98: 94: 89: 84: 83:Altoona Works 81: 77: 74: 73:Raymond Loewy 69: 65: 61: 57: 52: 48: 41: 36: 31: 19: 2390: 1386: 1367: 1344: 1332:. Retrieved 1328:the original 1324:The T1 Trust 1323: 1314: 1302:. Retrieved 1295:the original 1290: 1277: 1258: 1252: 1238: 1226: 1215:. Retrieved 1205: 1193:. Retrieved 1184: 1172:. Retrieved 1159: 1150: 1138:. Retrieved 1125: 1116: 1104:. Retrieved 1100:the original 1095: 1070: 1058: 1046:. Retrieved 1042:the original 1014:Staufer 1962 1009: 1002:Staufer 1962 944: 940: 927: 900: 895:The T1 Trust 894: 892: 873: 860: 857:PRR T-1 6110 843: 839:streamlining 818: 805: 779: 752: 733: 725: 698: 671:duplex-drive 667: 661: 528:Power output 444:Superheater: 338:Total weight 330: 325: 253:122 ft 210:Leading dia. 1462:locomotives 730:to New York 704:Development 681:streamlined 645:Disposition 346:Tender type 314:Loco weight 85:(5500–5524) 2543:Categories 1334:August 24, 1304:August 24, 1217:2006-08-25 1195:August 20, 1140:August 24, 986:References 499:Valve type 490:Valve gear 372:Water cap. 110:Build date 59:Power type 1231:Reed 1972 1174:24 August 1075:Reed 1972 1063:Reed 1972 876:dieselize 835:520 class 689:wheelslip 640:1953–1956 632:1952–1953 629:Withdrawn 613:First run 569:Operators 470:Cylinders 354:Fuel type 289:Axle load 241:Wheelbase 1867:de Glehn 1378:62-20878 1106:23 April 1048:23 April 952:See also 917:In media 883:No. 5550 668:class T1 650:PRR 5550 637:Scrapped 448:​ 415:​ 383:​ 380:Firebox: 198: in 149:​ 67:Designer 2382:4-4-4-4 2353:6-4-4-6 2308:4-4-6-4 2304:4-6-4-4 767:Hudsons 674:4-4-4-4 621:Retired 597:Numbers 331:Loaded: 262:⁄ 193:⁄ 161:4-4-4-4 79:Builder 2233:2-10-2 2098:2-10-4 2074:2-10-0 1572:B1 (e) 1532:B1 (s) 1376:  1265:  911:Boxpok 864:  762:built 666:(PRR) 605:Locale 564:Career 456:Type A 396:Boiler 326:Empty: 280:Height 250:Length 220:Driver 173:2β€²BB2β€² 95:(5550) 18:PRR T1 2357:6-8-6 2333:4-8-4 2284:4-6-4 2258:4-4-4 2213:4-8-2 2178:2-8-2 2123:4-6-2 2094:2-6-2 2014:2-8-0 1958:4-6-0 1878:2-6-0 1803:4-4-2 1618:4-4-0 1583:0-8-0 1523:0-6-0 1483:0-4-0 1298:(PDF) 1287:(PDF) 1169:(PDF) 1135:(PDF) 764:4-6-4 580:Class 272:Width 179:Gauge 156:Whyte 62:Steam 2432:HH2s 2427:HH1s 2417:HC1s 2412:CC2s 2407:CC1s 2355:and 2306:and 2167:K29s 2157:K21s 2096:and 1374:LCCN 1336:2019 1306:2019 1263:ISBN 1197:2016 1176:2019 1142:2019 1108:2017 1050:2017 870:Fate 662:The 624:1953 616:1942 551:4.33 474:Four 358:Coal 222:dia. 2519:E44 2514:E3b 2509:E2c 2504:E2b 2488:GG1 2483:FF2 2478:FF1 2473:DD2 2468:DD1 2463:BB3 2458:BB2 2453:BB1 2448:AA1 2422:HH1 2380:T ( 2351:S ( 2331:R ( 2302:Q ( 2282:P ( 2256:O ( 2247:N2s 2242:N1s 2231:N ( 2211:M ( 2192:L2s 2187:L1s 2176:L ( 2162:K28 2147:K4s 2142:K3s 2121:K ( 2112:J28 2092:J ( 2072:I ( 2063:H10 2012:H ( 1997:G53 1956:G ( 1947:F61 1942:F31 1937:F30 1932:F27 1927:F26 1922:F25 1917:F24 1912:F23 1907:F22 1902:F21 1876:F ( 1862:E28 1857:E23 1852:E22 1847:E21 1801:E ( 1787:D61 1782:D39 1777:D38 1772:D37 1767:D36 1762:D35 1757:D34 1752:D33 1747:D32 1742:D31 1737:D30 1732:D26 1727:D25 1722:D24 1717:D23 1712:D22 1707:D21 1702:D16 1697:D15 1692:D14 1687:D13 1682:D12 1677:D11 1672:D10 1616:D ( 1607:C31 1602:C30 1597:C29 1581:C ( 1521:B ( 1512:A5s 1481:A ( 1402:T1. 935:In 736:K4s 683:by 169:UIC 2545:: 2391:T1 2384:): 2371:S2 2366:S1 2359:): 2342:R1 2335:): 2322:Q2 2317:Q1 2310:): 2293:P5 2286:): 2267:O1 2260:): 2235:): 2222:M1 2215:): 2202:L6 2197:L5 2180:): 2152:K5 2137:K2 2132:K1 2125:): 2107:J1 2100:): 2083:I1 2076:): 2058:H9 2053:H8 2048:H6 2043:H5 2038:H4 2033:H3 2028:H2 2023:H1 2016:): 1992:G6 1987:G5 1982:G4 1977:G3 1972:G2 1967:G1 1960:): 1897:F3 1892:F2 1887:F1 1880:): 1842:E7 1837:E6 1832:E5 1827:E4 1822:E3 1817:E2 1812:E1 1805:): 1667:D9 1662:D8 1657:D7 1652:D6 1647:D5 1642:D4 1637:D3 1632:D2 1627:D1 1620:): 1592:C1 1585:): 1567:B8 1562:B7 1557:B6 1552:B5 1547:B4 1542:B3 1537:B2 1525:): 1507:A4 1502:A3 1497:A2 1492:A1 1485:): 1322:. 1289:. 1094:. 1082:^ 1021:^ 994:^ 922:A 808:S1 740:K5 584:T1 127:52 1451:e 1444:t 1437:v 1380:. 1338:. 1308:. 1271:. 1220:. 1199:. 1178:. 1144:. 1110:. 1052:. 932:. 716:. 297:) 295:t 264:4 260:3 257:+ 255:9 204:) 200:( 195:2 191:1 188:+ 186:8 20:)

Index

PRR T1

Raymond Loewy
Altoona Works
Baldwin Locomotive Works
Pennsylvania Railroad T1 Steam Locomotive Trust
Whyte
4-4-4-4
UIC
Gauge
Leading dia.
Driver
Trailing dia.
Wheelbase
Axle load
t
Adhesive weight
Coal
Cylinders
Cylinder size
Valve gear
Tractive effort
Factor of adh.
Pennsylvania Railroad
Class
PRR 5550
Pennsylvania Railroad
duplex-drive
4-4-4-4
steam locomotives

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