Model trains come in a variety of sizes to fit the space you have available. Or, to cram more stuff into the space you have available. Here are the common sizes of model trains, or, if you prefer, model train scales.
Sizes of model trains, or any other model, are measured in scale. Scale is a ratio of the model’s size relative to the real thing. Sometimes people will refer to gauge as well, which relates to the track, rather than the train.










