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
 Bowser 4 6 4 PRR GG 1 Electric Steam Engine Kit HO MIB  US $66.01
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 HO Scale RDC 3 Engine Dummy Santa Fe New Nice US $10.95
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 Engine Junk for Parts US $7.05
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 Lot HO Mantua Engine 9 Cars Caboose US $12.86
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 AHERN 6011A SET IN BOXES ENGINE 8 CARS C 7 US $40.00
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 Walthers NY Central Ho scale engine US $14.99
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O Scale
 1924 STUTZ Model C FIRE ENGINE use for Lionel MTH US $17.95
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 LIONEL RARE CSX GP 30 NON POWERED ENGINE US $159.95
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 LIONEL 6 18642 ENGINE TENDER 18642 MIB 8642 US $69.00
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 LIONEL 520 RED BOX CAB ELECTRIC ENGINE NICE LQQK WOW US $65.00
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 MARX 901 WESTERN PACIFIC GREEN YELLOW ENGINE LQQK US $15.50
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 LIONEL POLAR EXPRESS Engine TENDER TRAIN CAR NIB US $103.50
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All Other Scales
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Engine Junk for Parts US $7.05
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1924 STUTZ Model C FIRE ENGINE use for Lionel MTH US $17.95
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LIONEL RARE CSX GP 30 NON POWERED ENGINE US $159.95
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LIONEL 6 18642 ENGINE TENDER 18642 MIB 8642 US $69.00
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 Hornby 0 6 0 Class 3F LMS Tank Engine Steam New in Box US $57.83
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LIONEL 520 RED BOX CAB ELECTRIC ENGINE NICE LQQK WOW US $65.00
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