Coded track circuit, introduced about 7 yr ago, has been used for number of important installations in United States, eliminating line wires; particulars given are based chiefly on remarks made by J. J. K IRSCH, in paper presented before Assn American Railroads, in 1940; d-c and a-c coded track circuits discussed.
Coded track circuits
Ry Gaz
Railway Gazette and Railway News ; 76 , n 6
1942
3 pages
Article (Journal)
English
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