A lot of train systems are still using their original control systems because they work. In some cases the signal levers (that mechanically interlock and mechanically control the tracks) are connected to motors so that a new computerized system can remote-control the old system.
alt Hacker News
A lot of train systems are still using their original control systems because they work. In some cases the signal levers (that mechanically interlock and mechanically control the tracks) are connected to motors so that a new computerized system can remote-control the old system.
Tom Scott covered this in the UK. https://www.youtube.com/watch?v=omYfLDlt-MA