 The trains'speed are controlled by an automatic train protection (ATP) system. The speed codes are transferred from the ATP points in the infrastructure, using 75 hertz pulses in the tracks. The trains pick up the signals via antennas. The speed codes are 15 km / h (9 mph), 30 km / h (19 mph), 50 km / h (31 mph) and 70 km / h (43 mph). They are communicated to the engineer via signals in the driver's cab; in addition, the system will automatically reduce the speed, should the limit be exceeded. The driver can put the trains in an automatic mode, where the train itself adjusts its speed to the limit. The driver is always responsible for starting and halting the train at stations.
