Combination of manual and electric interlocking installed at East Springfield, Ill; signals normally clear for Wabash trains; manually operated derails and electric switch locks on opposing switching route.
Semi-automatic interlocking at crossing on Alton
Ry Signaling
Railway Signaling ; 28 , n 7
1935
Aufsatz (Zeitschrift)
Englisch
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Interlocking and automatic signals on Alton
Engineering Index Backfile | 1941
Alton railroad demonstrates feasibility of automatic interlocking at complex grade crossings
Engineering Index Backfile | 1932
Short-arm crossing gates on alton
Engineering Index Backfile | 1938
Short-arm crossing gates on alton
Engineering Index Backfile | 1938
Semaphore type crossing gate developed on alton
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