What are Train Scales? Sizes really. Each scale represents a different size. Each size is based on the actual size of the real train. For example, the HO scale is 1:87. That means that the size of the real train is 87 times bigger (Approx.) than the model.
G Scale: 1:22 | O Scale: 1:48 | HO Scale: 1:87 | N Scale: 1:160 | Z Scale: 1:220
There are many other scales available, the ones listed here are the ones that we carry at Time Machine Hobby.