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Model Train Scales Explained

How do model trains compare in size? What is the difference between Z, N , HO , S , O , or G model trains? If you are an experienced model railroader, then you’ll know that these are some of the most frequently asked questions about model trains.
As a handy reference here is a list of the main model train set scales from largest to the smallest:
O 1:48
S 1:64
HO 1:87
N 1:160
Z 1:220

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