Racor weight-responsive retarders with speed sensing elements and hydraulic switch machines that are controlled by retarder operator installed at Columbus, Ohio Grandview yard of Pennsylvania Railroad are described; master retarder and three group retarders are used to control speeds of cars being classified into any of nine tracks; car wheels traveling over notches in rail set up vibrations for speed sensing; electronic equipment acts on speed sensing vibrations to properly set retarders. (see also Ry Track and Structures v 61 n 3 Mar 1965 p 48-9)
PRR upgrades yard, improves service
Ry Signaling Communications
Railway Signaling and Communications ; 58 , n 3
1965
4 pages
Article (Journal)
English
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