Automatische treinbeïnvloeding

Automatische TreinBeïnvloeding or ATB ('Automatic train control') is a Dutch train protection system first developed in the 1950s. Its installation was spurred by the Harmelen train disaster of 1962.

ATB operates by the train collecting electrical signals from line-side apparatus and will override the driver's controls in the following situations:

a) failure to reduce speed at a caution signal (ATB will slow the train sufficiently to stop at the next signal).
b) failure to observe speed limit (ATB makes an immediate emergency brake application)

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