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.


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    Title :

    Protection for motor cars at tunnels


    Additional title:

    Ry Signaling Communications



    Publication date :

    1956


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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