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
 HO SCALE TRAINS ENGINE NORFOLK SOUTHERN GP50 LOCOMOTIVE  US $21.71
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 HO scale Bachman Engine and powered B unit BO DCC US $37.95
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 LOT OF 6 HO ENGINES F SERIES US $39.95
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 d 1976 Lionel HO Scale Engine Burlington Northern US $9.99
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 2810 MOTORIZING KIT HO GUAGE INSTRUCTIONS ENGINE TRAIN US $.99
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 CENTRAL RAILROAD CO NEW JERSEY HO ENGINE 1540 US $10.00
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O Scale
 Atlas O Ind Rail Great Northern Die Cast Steam Engine US $94.95
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 Lionel 28883 Thomas Diesel Engine MIB US $77.95
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 LIONEL O 28558 MKT GP7 ENGINE BOX US $6.00
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 LIONEL GG1 ENGINE TRUCK FRAME PAIR US $6.00
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 LIONEL 6 18805 UP RS 3 Diesel Locomotive Engine used US $125.00
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 LIONEL 2065 4 6 4 ENGINE W 2046W TENDER EXCOND US $99.99
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All Other Scales
 triang oo princess elizabeth 4 6 2 engine and tender US $33.71
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 Micron Art Z Scale 1914 Knox Chemical Fire Engine NEW US $29.99
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Lionel 28883 Thomas Diesel Engine MIB US $77.95
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LIONEL GG1 ENGINE TRUCK FRAME PAIR US $6.00
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LIONEL 6 18805 UP RS 3 Diesel Locomotive Engine used US $125.00
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LIONEL 2065 4 6 4 ENGINE W 2046W TENDER EXCOND US $99.99
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