Automatic block signals installed between Detroit and Pontiac; color-light signals speed up train movements safely on busy section of suburban zone.
Grand trunk western installs automatic signals on 22 miles of double track
Ry Signaling
Railway Signaling ; 25 , n 11
1932
Article (Journal)
English
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Seaboard installs 272 miles of single-track automatic block
Engineering Index Backfile | 1946
Louisville and Nashville installs automatic block signals on 130 miles of single track
Engineering Index Backfile | 1930
Big four installs signaling on 45 Miles of double track
Engineering Index Backfile | 1931
Norfolk and Western installs C.T.C. on 14 miles of single track
Engineering Index Backfile | 1943
Erie installs either-direction signaling on seven miles of double track
Engineering Index Backfile | 1932