| 11. | All Metro-North and Long Island Rail Road trains have cab signals, as do some New Jersey Transit trains.
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| 12. | At no point can the ATC system override the maximum speed limit enforced by the cab signal system.
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| 13. | Occasionally, cab signals are used by themselves, but more commonly they are used to supplement signals placed at lineside.
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| 14. | It and the former Conrail properties are the only CSX lines to have cab signal requirements on their entire system.
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| 15. | Modern CDUs on passenger trains are often integrated with the speedometer, as cab signals now serve a speed control function.
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| 16. | Over time the PRR installed cab signals over much of its eastern system from Pittsburgh to Philadelphia, New York to Washington.
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| 17. | The rebuild will also include the installation of locomotive speed limiter ( LSL ), and cab signals and other electronics upgrades.
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| 18. | Then, the train's speed must be further reduced to no more than within 70 seconds of the initial cab signal drop.
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| 19. | Pulse code cab signals work by sending metered pulses along an existing AC track circuit operating at some chosen carrier frequency.
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| 20. | In more advanced versions, cab signals are linked to automated controls that slow or stop a train if it violates signals.
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