The world of model railroading, in every scale, offers a large selection of model train locomotives. Steam, diesel, and electric locomotives are available in sizes ranging from G gauge to Z scale. Steam locomotives are quit popular among model train hobbyists and collectors alike. The detailing of modern day steam locomotives is outstanding. Although steam locomotives have long since been retired from the work force they are still working on model train layouts. The smoke billowing from the smoke stack and the chuffing sound as the locomotive gains speed brings back memories of days when the rails were populated by steam driven locomotives.

Locomotives not only haul freight and livestock but people as well. Amtrak operates passenger trains both diesel and electric.  While electric locomotives operate on the Northeast, diesels may be found anywhere in the United States. Operating passenger trains from the east to west coast and visa versa utilizes numerous types of diesel locomotives. Both EMD and GE types of locomotives pull the Amtrak passenger cars.

Locomotives, more powerful than ever before, haul coal cars made up of over a hundred cars running across the open prairies. These large powerful diesel locomotives are widely used by the Union Pacific and BNSF railroads.

The word locomotive is defined as a self-propelled, vehicular engine, powered by steam, diesel, or electricity, for pulling or sometimes pushing a train or individual railroad cars.