This came from the 1915 Machineries Handbook. These dimensions are still standard today for schedule 40 pipe. On a Westinghouse AB brake system the air piping from the Distributing Valve is 3/4 in. pipe. From the chart we can see that 3/4 in. pipe has an external diameter of 1.050 in. If we divide that by 48 (O Scale is 1/48th size) we get .022 in. So for our brake system we would want to use .022 in diameter wire.

pipe dimensions0001
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