Jim writes:

“Here is an interesting question to ponder. Where is track measured?? At the outer rail, the outer point of the ties or the center of the two rails? I put together a full circle of 18″ radius track to answer a track planning question. The full circle assembled – I measured the diameter – the outer rail to outer rail was roughly 34 inches. Ergo the question of where track is measured to acquire the radius of a curve.”

Add your comment below.