The first toy trains were made of lead and had no moving parts. Some had wheels which flipped, but these needed to be pushed or pulled. A few of the early 19th-century drive toy trains were made from tinplate, such as the large, durable, stylized locomotive toys from the U.S., which were painted red and gold and decorated with hearts and flowers. train model riding
Around 1875, technological advancements in materials and manufacturing allowed tin to be scraped, cut, rolled, and lithographed faster than previously.
Toy trains were altered when Märklin, a German firm which specialized in doll house accessories, sought to make an equivalent toy for boys in which a constant revenue stream could be ensured by purchasing add-on accessories for decades after the initial purchase. Along with boxed sets comprising a train and track, Märklin offered additional track, rolling stock, and buildings sold separately, creating the predecessor to the modern model train layout featuring buildings and scenery in addition to a working train.
Electric trains followed, with the first appearing in 1897, produced by the U.S. company Carlisle & Finch. As residential use of electricity became more common in the early 20th century, electric trains gained popularity and as time went on, these electric trains grew in sophistication, gaining lighting, the ability to change direction, to emit a whistling sound, to smoke, to remotely couple and uncouple cars and even load and unload cargo. Toy trains from the first half of the 20th century were frequently made of lithographed tin; afterwards trains were frequently made mostly of plastic.
Pull toys and wind-up trains were marketed by kids, while electrical trains were marketed towards teens, particularly teenaged boys.
Now, S gauge and O gauge railroads are still considered toy trains even by their own adherents and are often accessorized with semi-scale model buildings by Plasticville or even K-Line (who owns the rights to the Plasticville-like buildings produced by Marx in the 1950s into the 1970s). However, as a result of their high price, one is more inclined to find an HO scale or N scale train set in a toy store than an O scale collection.
Many modern electrical toy trains comprise sophisticated electronics that exude digitized sound effects and permit the operator to securely and easily run several remote controller trains on one loop of track. In recent years, many toy train operators may operate a train with a TV camera in the front of the motor and hooked up to a display, such as computer monitor. This will show a picture, like that of a real (smaller size) railroad.
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