New automatic block signal systems, easily manipulated interlockings, centralized traffic control, and many other new developments facilitate train movements.
Faster trains require modern signaling
Ry Age
Railway Age ; 109 , n 20
1940
Aufsatz (Zeitschrift)
Englisch
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Modern signaling keeps trains moving
Engineering Index Backfile | 1942
|Faster trains, better trackwork
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Engineering Index Backfile | 1945