. Electric railway journal . San Francisco Track—Pronged Hook for Tearing UpConcrete tenance of way and construction, assisted by W. C. Cham-berlain, assistant engineer. ELECTRIC TRACK RECONSTRUCTION Most of the old electric track was built with a concretesubstructure, and its renewal means that this substructurehas to be removed. Where asphalt paving has been usedthis is first cut away. The concrete between the rails andabove the ties is then either loosened by a plow which is. San Francisco Track—Setting Drop-Hammer Legs pulled by the hoisting winch on a 8-ton derrick car, or it isbroken up
. Electric railway journal . San Francisco Track—Pronged Hook for Tearing UpConcrete tenance of way and construction, assisted by W. C. Cham-berlain, assistant engineer. ELECTRIC TRACK RECONSTRUCTION Most of the old electric track was built with a concretesubstructure, and its renewal means that this substructurehas to be removed. Where asphalt paving has been usedthis is first cut away. The concrete between the rails andabove the ties is then either loosened by a plow which is. San Francisco Track—Setting Drop-Hammer Legs pulled by the hoisting winch on a 8-ton derrick car, or it isbroken up by means of a 3100-lb. drop-hammer rigged onthe boom of the derrick. The cost of the two processesamounts to a small fraction of a cent per foot of track. March 15, 1913.] ELECTRIC RAILWAY JOURNAL 463 The concrete paving base on the 2-ft. strip outside therails is next broken by means of the same drop-hammer,which strikes a blow on 30-in. sections of 9-in. girder rail,laid on its flat side on the concrete. This shatters the track as it advances. When this work has been completed,the rail, ties, concrete, spikes, old chairs, etc., are lying looseand ready to be loaded on cars to take to the dump. The next process is that of excavating the .French by
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