After extensive use, beginning in 1886, of power signaling of individual lever type, Italian railways are turning to relay interlocking; in present system at Bologna, operation of one switch sets all points in route and clears relative signal; complete track circuiting, with route and approach locking and other controls, is provided throughout, with color light signals.
Relay interlocking at Bologna
Ry Gaz
Railway Gazette ; 98 , n 13
1953
2 pages
Article (Journal)
English
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