Near Aspen, Wyo, Union Pacific has installed switch-key control of home signals governing train movements through Aspen tunnel (5941 ft) on eastbound main track, and through Altamont tunnel (6705 ft) on westbound; four-aspect, automatic block signaling is in service on both tracks; special signal controls hold trains out of tunnels for 15 min allowing man or motor car to clear tunnels before train can proceed.
Protection for motor cars at tunnels
Ry Signaling Communications
Railway Signaling and Communications ; 49 , n 4
1956
Article (Journal)
English
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