What is another word for iron horses?
Pronunciation: [ˈa͡ɪ͡ən hˈɔːsɪz] (IPA) 
Iron horses is a colloquial term for locomotives or trains. Synonyms for this term include steam engines, steam locomotives, railway engines, diesel engines, electric trains, and railcars. These terms are used to define locomotives or trains that carry passengers, cargo or a combination of both. The term "iron horse" was first used in the mid-1800s, during the industrial revolution in the United States. It was a slang term used for the first steam locomotives which often resembled horses in shape. The term has since evolved, and these synonyms are used interchangeably to describe the various types of trains and locomotives that have since come into existence.
