For important train commuters lines I believe something has to be done. A failure should not affect the peoples whole day. Trying to find a bus, taxi or getting stuck at the Central City Station.
Its not enough to build additional tracks for higher traffic volume. The tracks are dependent on the same failures. If built like usual.
The idea is to build an additional independent train commuter line. Such that if one line gets an error people can go to the other line.
So for example. A two independent line system should have independent power supplies and maybe a big and a little Central Station.
With this idea. People get a much needed backup and for a carbon emission free future public transport must have an excellent uptime with zero stops.
One idea is that to create extra stations along the extra way. Since stations are gold to the neighborhood. The number of housings will ?increase overall. If you don’t make the train system error resilient then the problem with going by train will persist.