I agree with bob2 That " means Inch or inches. Without that, 1/4 scaLE models would run on track over 1 foot wide and 1/2 scale models would run on track over 2 feet wide based on 4 feet 8 1/2 inches for full size. 1/2 scale models would be on the size range of at least for trucks and mechanical components of Maine 2 ft narrow gauge.
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