Prague metro broke down for 45 minutes last Saturday

For the first time in the history of Prague metro (running from 1975) all three lines stopped at one moment and were out of order for 45 minutes. It happened on Saturday between 17:15 and 18:00, luckily off the peak hours.

The probable cause of the collaps was a sudden increase of electric voltage that disabled the central computer controlling the movements of metro trains. The dispatchers let the trains go to the nearest station. All passengers had to get off the metro.

The metro in Prague is built like a harmonica. One section is built uphill, the other one downhill. In case of total lack of electricity, the trains would get to the station by its own gravity.