Description of loudspeaker communication system in Roper Yard of Denver and Rio Grande Western, Salt Lake City, Utah, which provides 2-way communication between yardmasters in elevated towers and yard crews working near talk-back speakers located along leads and at other strategic points; monitoring loudspeakers are located in yard office and in office of assistant superintendent. (see also Ry Signaling v 40 n 3 Mar 1947 p 172-7)
Loud-speakers on Rio Grande
Ry Age
Railway Age ; 122 , n 12
1947
2 pages
Article (Journal)
English
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Engineering Index Backfile | 1947
Loud speakers aid yard operation
Engineering Index Backfile | 1944
Loud speakers aid yard operation
Engineering Index Backfile | 1944
NTRS
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