Revisions of specifications for movable bridge interlocking, electric locks for interlocking machines, style "A" locking and S. and F. locking of mechanical interlocking machines, and electric switch locks; factors which govern in determining type of interlocking which should be installed; protection of traffic against slides and rock falls.
Committee II -- Interlocking
Assn Am Railroads -- Advance Reports
1946
11 pages
Report
English
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