Since 1930, Chicago and Alton has constructed four automatic interlocking plants at railroad grade crossings formerly protected by mechanical interlocking; plant at White Hall, Ill, satisfies every operating requirement and returns annually 71% of initial investment; three other installations completed in past 2 1/2 years.
Alton railroad demonstrates feasibility of automatic interlocking at complex grade crossings
Ry Signaling
Railway Signaling ; 25 , n 11
1932
Article (Journal)
English
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Gates at seven alton grade crossings
Engineering Index Backfile | 1940
Gates at seven alton grade crossings
Engineering Index Backfile | 1940
Interlocking and automatic signals on Alton
Engineering Index Backfile | 1941
Engineering Index Backfile | 1895
|Engineering Index Backfile | 1895