A railroad crossing signal test system includes a power source, a timer device configured to provide periodic electrical pulses, and first and second relays. The first relay can be configured to alternately provide the periodic electrical pulses to a left and right light of the railroad crossing signal. The second relay can be configured to alternately change a polarity of a common connection between the left light and the right light of the railroad crossing signal. The test system also includes a first switch configured to test a bell of the railroad crossing signal, a second switch configured to enable flashing of the left light according to the periodic electrical pulses, and a third switch configured to enable flashing of the right light according to the periodic electrical pulses. The system also includes test leads for electrically coupling the test system to test terminals of the railroad crossing signal.
SYSTEM FOR TESTING RAILROAD CROSSING SIGNALS
2025-01-23
Patent
Electronic Resource
English
IPC: | B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC |
Improvement of railroad crossing signals
IEEE | 1999
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Engineering Index Backfile | 1934