It's a bit like here in the UK. There used to be a lot more rail tracks but got removed, presumably when cars because common and lorries were capable of carrying large amounts of goods.
It's a huge shame because a lot of places which were connected no longer are. I would love to be able to hop on a train and get to smaller rural areas rather than large towns and cities on a route which heads to London and back.
There is some success though, if anybody is interested then look at Swanage railway. They managed to get everything undone and reconnect to the national network and is now a hotspot for old steam engines.