4 ms·

So is London’s

• dx034 9y ago
  Most signalling systems in London are fairly new. Rolling stock is the bigger problem with some parts from the 1970s (Picadilly line). New signals were the main reason they could increase frequencies on lines like Northern, Central and Victoria in recent years. What helps London is that the system shuts down for a few hours each night (except weekends on some lines). That allows most repairs and maintenance to take place without altering schedules.