Tabulation by Canadian and United States railroads of installations in following classes: automatic block, retarders and switches in yards, centralized traffic control, interlocking, highway crossing protection, spring switches; table by type of construction for years 1942 through 1952. (see also Ry Signaling and Communications v 46 n 1 Jan 1953 p 33-8)
Signal construction [midline ellipsis] 1952
Ry Age
Railway Age ; 134 , n 2
1953
6 pages
Article (Journal)
English
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Signal construction [midline ellipsis] 1952
Engineering Index Backfile | 1953
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Engineering Index Backfile | 1945
"In my opinion [midline ellipsis] "
Engineering Index Backfile | 1947
Engineering Index Backfile | 1952