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Driver Vigilance System Used By Indian Railways
driver vigilance or driver alertness system used by IR
Several loco classes have speed limiters with buzzers that go off when the prescribed speed is exceeded. In some cases these may also result in the application of brakes. Some WAP-4 locos have the buzzer system and it is set for a speed of 130km/h although they are capable of going faster, while a few WAM-4 locos have it at 110km/h (although not all WAM-4 locos have the buzzer system as it requires a relatively more recent speedometer assembly to be retrofitted in them). Some WAG-5 locos and others also have such warning systems. The WCAM-3 loco, limited to 105km/h by its bogies, has the buzzer set to its top speed.