Model railroad engines, like all train engines, are the power infront (or behind) the train. The engine is able to pull all the fully loaded trains appropriately. With model railroad trains the engine size is dependent on the scale being used. The largest scale is the Live Steam engine which is a human rideable train. The most common size of scales are the O and HO scales.
Most model trains operate on low DC voltage with some exceptions such as the Lionel and Marklin brand engines.
HO Scale
 Bachmann HO Scale Sante Fe Engine Train 307  US $19.99
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 spokane portland seattle HO train loco engineathern42 US $26.00
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 BACHMANN HO SANTA FE DIESEL ENGINE AND RARE B UNIT US $39.99
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 spokane portland seattle HO train loco engine 803 US $24.99
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 Mantua 2 6 6 2 train engine with tender undecorated NEW US $71.00
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 HO BNSF train engine loco 2099 US $13.28
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O Scale
 LIONEL ENGINES AND GREAT TRAINS SETS POST WAR ENG 2046 US $275.00
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 LIONEL ENGINES AND GREAT TRAINS SETS AMTRAK BUDD CARS US $238.00
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 LIONEL ENGINES AND COAL CARS WITH SOUND OF STEAM 8615 US $76.00
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 LIONEL SHELLS NEW AND FRAME ASSEM 44 TON ENGINE US $42.00
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 Lionel post war 0 scale ENGINE NO 629 BURLINGTON US $500.00
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 Lionel Train 2328 0 scale engine BURLINGTON route GP7 US $500.00
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All Other Scales
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Mantua 2 6 6 2 train engine with tender undecorated NEW US $71.00
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 LGB 2019S electronic engine Colorado and Southern US $406.51
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 AMTRAK F 3 Diesel LOCOMOTIVE Powered Engine US $9.15
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LIONEL SHELLS NEW AND FRAME ASSEM 44 TON ENGINE US $42.00
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Lionel post war 0 scale ENGINE NO 629 BURLINGTON US $500.00
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Lionel Train 2328 0 scale engine BURLINGTON route GP7 US $500.00
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