What driver vigilance or driver alertness systems are used by IR in its locomotives?
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. The newer loco classes (WAP-5, WAP-7, WAG-9) have provisions in their original designs for setting a speed limit, which, if exceed results not only in the warning buzzer/light going off but also apply the emergency brakes to slow down to below the prescribed speed. This system, however, is not thought to be actually deployed in any of the locos currently in use. The top spe
