Controlled non-interlocking switching and color light signals facilitate and expedite freight switching movements in classification yard and at junction point in 25th Street freight classification yard at Pittsburgh, Pa; special switch indicators; trimmer and hump signals; panel type control machine; special time delay; circuit principle; natural gas engine generator.
Monongahela connecting railroad installs yard signaling
Ry Signaling Communications
Railway Engineering and Maintenance ; 44 , n 12
1951
4 pages
Article (Journal)
English
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