In the US it was 2 inches. Used by Voltamp, Carlisle and Finch, and others. In Europe it was 54mm, but this was top center of one rail to the other.
Thanks. The reason for the question is The newer Lionel battery powered Ready To Play sets are no longer G Gauge, they are #2 gauge but do not say that. Now I know. . What idiot dreamed that up. On the plus side a little bit of regauging the wheels allows them to run on STD Gauge track.
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