Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 544
is affected by the presenceof a train within a block. Where the railroad is equipped forthird rail electrical propulsion the single rail system is gen-erally used; when steam engines are employed the doubletrack system is used. ELECTRIC RAILWAYS 2,635 Railway Signals,—These consist of colored… … Fig. 3,719.—Insulated rail joint at end of a block section of track. A type used for heavy mainline traffic. Insulating fibre is placed between the rail ends and clamped between the railand the joint plates and insulated bushings are placed around the bolts. INSULATION
Electrical engineering
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