Interference has been observed on US metros between the latest chopper controlled trains and coded track circuits used for train detection as well as cab signals and ATO. The most dominant interference mechanism is inductive coupling between equipment carried on the car and the loop formed by the rails and axles under the car. Currents induced in this loop can result in transient 'track clear' indications as a powered car passes over the impedance bond separating adjacent track circuits. A joint government-industry working group is developing ways of quantifying and controlling the problem.
Choppers affect operation of AF track circuits
Chopper-Schaltungen beeinflussen U-Bahnverkehr
Railway Gazette International ; 136 , 4 ; 291-294
1980
4 Seiten, 3 Quellen
Article (Journal)
English
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