I seem to recall thet the WABCO catalogs had dimensions of the brake cylinders... but one general illustration covered all of one type, with a table of dimensions. In fact, the illustrations published in the older Car Builder's Cyc's are the same letter keys for the dimensions, but omit the tables. The triple valves, however, have few if any dimensions.

Obviously both Wabco and New York had drawings of the parts for their internal use in manufacturing, but I've never found a source.

Dennis Storzek