Reply to "A question about Lionel track pin size"

The answer you are looking for is YES, there is a distinct difference. The rail height of 027 track is 7/16"' high, to top of the rail. The O track stands at 11/16" high, to top of the rail. That means that All the 027 track would need shims to raise the 027 track up to the rail height of the O track. The track pins are also different with the O pins measuring 7/64" and the 027 measures 3/32". There are the two problems that you have to deal with. Others above didn't give the measurement, but offered various solutions.
It's your choice of what to do.

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