401
U
U C equipment P M features only --- 66
“ " tests proposed..........8
“ pneumatic equipment, descrip-
tion..........................50
Universal valve, diagrammatic....55
« “ photograph of ......54
V
Water cooling brake shoes...........281
Wear, brake shoes..........139, 251, 278
" factor............- ...........278, 279
Westinghouse Air Brake Co............5, 6, 50
Westinghouse quick action automatic
brake................................36
Wheel load, brake shoe tester---244, 277
" sliding................20, 149, 151, 154
Z
Variation in tests...............268
w
Warping of brake shoes.......264, 274
Zero circuit breaker.................19, 23, 30