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
 NEW BACHMANN HO THOMAS FRIENDS JAMES RED ENGINE SET  US $79.00
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 Athearn Trains Great Northern Engine F45 US $100.00
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 HO SCALE TRAINS ENGINE CHESSIE F 2 RAILROAD LOCOMOTIVE US $11.49
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 Athearn HO model railroadflywheel drive engine 2 pcs US $19.05
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 HO scale Railroad Vintage Old engine metal frame US $6.50
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 Spirit of 76 H0 Scale Locomotive Engine 1776 US $15.00
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O Scale
 mth dash 8 40c narrow nose diesel engine 20 264 2 US $124.05
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 Lionel Prewar 1666 Steam Engine w 265W Whistle Tender US $107.50
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 VINTAGE PREWAR LIONEL PASS TRAINS AF ENGINE US $300.00
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 Lionel engine 239 Rock Island tender runs great nice US $36.00
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 Lionel 90th Anniversary Train Engine sounds US $43.77
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 2 Lionel engines 1645 and 561 US $47.01
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All Other Scales
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mth dash 8 40c narrow nose diesel engine 20 264 2 US $124.05
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Athearn Trains Great Northern Engine F45 US $100.00
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Lionel Prewar 1666 Steam Engine w 265W Whistle Tender US $107.50
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 N Scale 1 150 Tomytec Truck 5 Hino Old Type Fire Engine US $24.80
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VINTAGE PREWAR LIONEL PASS TRAINS AF ENGINE US $300.00
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 N Scale 1 150 Tomytec Truck 5 Hino Cruising Fire Engine US $24.80
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