Standard
It is very hard to determine what factor makes the locomotive largest: It could be the heaviest, longest, most cylinders, most horse power, or most wheels. It is often defined as the longest in absolute length, however there is even a debate on whether or not to include the tender in the measurement. To establish the "largest" category, several base factors simply take precedence: overall weight, which gives traction over driving axles; actual size (length & height of engine itself); and power, which may be given in terms of raw horsepower, tractive effort, available power at axles (shaft horsepower) or in the case of steam locomotives, available steam on a sustained basis.
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| Re 465 | BLS, Bern Loetschberg Simplon, Switzerland | Re 465 001 - 465 0018 | SLM, ABB | 1994 - 1997 | electric | Bo-Bo | weight: 84 tons (metric) | 9'520 HP (7'000 kW) [Tractive force: 300 kN (30,6 tons) | most powerful locomotive with only four axles, similar locomotives with slightly different technical data are in operation with SBB (Re 460; 119 pc/ NSB (El 18; 22 pc)/ VR (Sr2; 20pc)/ KCRC (Hong Kong; 2 cp) | |
| Re 6/6 | SBB, Swiss Federal Railway | 11601-11689 | SLM, MFO/BBC/Sécheron | 1972; 1975-1980 | electric | Bo-Bo-Bo | weight: 120 tons (metric) | 10'908 HP (8'020 kW) [Tractive force: 398 kN (41 tons) | in operation (October 2012), revised classification Re 620, most powerful single frame locomotive till China Railways HXD1B appeared | |
| Re 4/4 | BLS (Bern Loetschberg Simplon, Switzerland) | 161-195 (Re 425 161 - Re 425 195) | SLM / BBC | 1964-1983 | electric | (Bo)(Bo) | weight: 80 tons (metric) | 6'772 HP (4980 kW); tractive force 314 kN (32 tons) | in operation (October 2012) | |
| Ae 8/8 | BLS (Bern Loetschberg Simplon, Switzerland) | 271-275 | SLM / BBC | 1959-1966 | electric | (Bo)(Bo)+(Bo)(Bo) | weight: 160 tons (metric) | 8'806 HP (6475 kW); tractive force 471 kN (48 tons) | 1 preserved in working order | |
| Ae 6/6 | SBB, Swiss Federal Railway | 11401-11520 | SLM, MFO/ BBC | 1952; 1955-1966 | electric | Co-Co | weight: 120 tons (metric) | 6'000 HP (4'410 kW) [Tractive force: 392 kN (40 tons) | still in operation (October 2012) | |
| Ae 6/8 | BLS (Bern Loetschberg Simplon, Switzerland) | 201-208 | SLM / Sécheron | 1939 | electric | (1'Co)(Co1') | weight: 140 tons (metric) | 6'000 HP (4410 kW); tractive force 353 kN (36 tons) | 2 remain as historic pieces in working order | |
| Ae 8/14 | SBB, Swiss Federal Railway | 11852 | SLM, MFO/ BBC | 1939 | electric | (1'A)A1'A(A1')+(1'A)A1'A(A1') | weight: 236 tons (metric) | 11'100 HP (8'162 kW)[[Tractive force: 490 kN (50 tons) | Exhibit at Swiss Transport Museum | |
| PRR GG1 | Pennsylvania Rail Road (PRR) & PennCentral & Amtrak & NJ Transit | 4800-4938, 900-929 | Altoona Works, General Electric | 1934–1943 | Electric | 2-C+C-2 (4-6-6-4) | 208.9 to 216.4 | 4,629 horsepower (3,452 kW), Tractive Effort: 65,500 lbf | Most scrapped; 15 production locomotives and the prototype preserved in museums | |
| Class 461 | Železnice Srbije | ŽS461-0/1, ŽS461-2 | Electroputere Craiova, Romania | 1965 – 1991 | Electric | Co'Co' | 120 t | 5100 kW 7638 horsepower | In operational in Romania,Serbia, Montenegro, Bulgaria, Hungary, Macedonia. | |
| Allegheny | Chesapeake and Ohio Railway (C&O) & Virginian Railway (VGN) | 1600 to 1659 (C&O) 900 to 907 (VGN) | Lima Locomotive Works | 1941 – 1948 | Steam | 2-6-6-6 | 544 t | 7,500 horsepower (5,593 kW) | Two on static display | |
| Big Boy | Union Pacific | X4000 to X4024 | ALCO | 1941 – 1944 | Steam | 4-8-8-4 | 548 t | 6,290 horsepower (4,690 kW) | Several in static display | |
| XA Triplex | Virginian Railway | 700 | Baldwin | 1916 | Steam | 2-8-8-8-4 | 383 t | Unknown, Tractive Effort: 199,560 lb simple; 166,600 lb compound | Rebuilt into separate locomotives | |
| Challenger | Union Pacific | 3985 | ALCOhale | 1936 – 1943 | Steam | 4-6-6-4 | 485 t | 6,200 horsepower (4,623 kW) | Operates in excursion service; largest operational steam locomotive as of 2007 | |
| GTEL 8500 'Big Blow' | Union Pacific | 1-30 (control cab), 1B-30B (turbine unit) | General Electric | 1958 – 1961 | Gas turbine-electric | C-C+C-C | 425 t | 8,469 horsepower (6,315 kW) Over 10,000hp at lower altitude and ambient temperatures. | Two preserved in museums. Most powerful internal combustion locomotive ever built. | |
| EMD DDA40X | Union Pacific | 6900-6947. | Electro-Motive Division of General Motors | 1969 – 1971 | Diesel-electric | D-D | 244 t | 6,600 horsepower (4,922 kW) | One operational, several in museums; largest operational single-unit diesel locomotive and the most powerful | |
| SJ Dm3 | Malmbanan | ASEA | 1953 – 1971 | Electric | 1'D+D+D1' | 273 t | 9,655 horsepower (7,200 kW) | Highest continuous tractive effort in the world when built, most powerful locomotive using jackshafts | ||
| DB Class 103 | 1970 – 1973 | Electric | Co'Co' | 114 t | 9,977 horsepower (7,440 kW) | |||||
| 060-EA | Romanian Railways(CFR - Căile Ferate Române) | 001- 1000 | Electroputere Craiova | 1970 - 1991 | Electric | Co'Co' | 120 to | 6,839 horsepower (5,100 kW) | Most powerful locomotive in 1970's; Highest continuous tractive effort in the world | |
| 060-EA Softronic Phoenix version | Romanian Railways (CFR - Căile Ferate Române) and Hungarian State Railways ( MÁV ) | 001, 2001-2004 | Softronic Craiova | 2009 - present | Electric | Co'Co' | 120 to | 8,851 horsepower (6,600 kW) | Most powerful locomotive with highest continuous tractive effort | |
| Softronic TransMONTANA (060-EA version) | Romanian Railways (CFR - Căile Ferate Române) | 1 | Softronic Craiova | 2010 | Electric | Co'Co' | 120 to | 10,997 horsepower (8,200 kW) | ||
| SBB-CFF-FFS Re 620 | Gotthardbahn | BBC | 1972 – 1980 | Electric | Bo'Bo'Bo' | 120 t | 10,527 horsepower (7,850 kW) | Most powerful single frame locomotive when built | ||
| JR Freight Class EF200 | JR Freight | Hitachi Ltd. | 1990 – | Electric | Bo'Bo'Bo' | 100.8 t | 8,046 horsepower (6,000 kW) | Most powerful single frame narrow-gauge locomotive in series production | ||
| EMD SD90MAC | Union Pacific | 8500-8561 | Electro-Motive Diesel | 1996 – 2002 | Diesel-Electric | C-C | 210 t | 6,300 horsepower (4,698 kW) | Retired from service, some on lease with EMLX | |
| GE AC6000CW | Union Pacific; CSX Transportation; BHP Billiton | 7500-7579 (being overhauled and renumbered to 69xx); 600-699, 5000-5016; 6070-6077 | General Electric | 1996 – 2001 | Diesel-Electric | Co'Co' | 210 t | 6,250 horsepower (4,661 kW) | Actual HP output is 4350; due to problems with engine. | |
| Indian locomotive class WAG-9 | Indian Railways | Chittaranjan Locomotive Works India | 1998 | Electric | Co'Co' | 123 t | 6,350 horsepower (4,735 kW) | Most powerful electric locomotive in India as of 2010. | ||
| China Railways HXN3 | China Railways | HXN30001-HXN30300 | Dalian Locomotive, EMD | 2008 – | Diesel-Electric | Co'Co' | 150 t | 6,300 horsepower (4,698 kW) | Most powerful Diesel-Electric locomotive in active production. | |
| China Railways HXN5 | China Railways | HXN50001-HXN50300 | GE, CSR Qishuyan Locomotive | 2008 – | Diesel-Electric | Co'Co' | 150 t | 6,250 horsepower (4,661 kW) | Most powerful Diesel-Electric locomotive in active production. | |
| China Railways HXD1 | China Railways | HXD10001-HXD10220 | CSR Zhuzhou Electric Locomotive, Siemens | 2006 – 2008 | Electric | Bo'Bo'+Bo'Bo' | 200 t | 12,874 horsepower (9,600 kW) | ||
| China Railways HXD2 | China Railways | HXD20001-HXD20180 | Datong Electric Locomotive, Alstom | 2006 – 2008 | Electric | Bo'Bo'+Bo'Bo' | 200 t | 13,410 horsepower (10,000 kW) | ||
| China Railways HXD3 | China Railways | HXD30001-HXD30890, HXD38001-38150 | Toshiba, Dalian Locomotive | 2006 – 2009 | Electric | Co'Co' | 150 t | 9,655 horsepower (7,200 kW) | ||
| China Railways HXD1B | China Railways | HXD1B0001-HXD1B0500 | CSR Zhuzhou Electric Locomotive, Siemens | 2009 – | Electric | Co'Co' | 150 t | 12,874 horsepower (9,600 kW) | Most powerful single frame locomotive in series production | |
| China Railways HXD2B | China Railways | HXD2B0001-HXD2B0500 | Datong Electric Locomotive, Alstom | 2009 – | Electric | Co'Co' | 150 t | 12,874 horsepower (9,600 kW) | Most powerful single frame locomotive in series production | |
| China Railways HXD3B | China Railways | HXD3B0001-HXD3B0500 | Dalian, Bombardier | 2009 – | Electric | Co'Co' | 150 t | 12,874 horsepower (9,600 kW) | Most powerful single frame locomotive in series production | |
| China Railways HXD1C | China Railways | HXD1C0001-HXD1C0990 | CSR Zhuzhou Electric Locomotive, Siemens | 2009 – | Electric | Co'Co' | 150 t | 9,655 horsepower (7,200 kW) | ||
| China Railways HXD2C | China Railways | HXD2C0001- | Datong Electric Locomotive, Alstom | 2010 – | Electric | Co'Co' | 150 t | 9,655 horsepower (7,200 kW) | ||
| China Railways HXD3C | China Railways | HXD3C0001- | Dalian, Bombardier | 2010 – | Electric | Co'Co' | 150 t | 9,655 horsepower (7,200 kW) | ||
| IORE | Malmbanan | IORE 101- IORE 126 | Bombardier | 2000 – 2004 | Electric | Co'Co'+Co'Co' | 360 t | 14,483 horsepower (10,800 kW) for a pair, possible to operate halves which is not usually done |
Highest continuous tractive effort in the world |
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Read more about this topic: List Of Largest Locomotives By Mass
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