The trains should only run on tracks that are completely enclosed (More control on the environment will realize better reliability, and as an aside nicer living space. Raised tracks are ugly.), Also they should run on rubber wheels like the Montreal metro has since 1966. Both metros should have barrier between platforms and tracks since they know where the doors will open. It's sad but a non-negligible cause of delay…
As someone who's lived in both Montreal and the Washington DC area (and used Metro for commuting in both), I have to say that a mixture of raised and buried tracks are really the only way to have a practical system if you want it to work beyond the dense downtown area. Many of the more open places in metropolitan Montreal like Lachine don't have any Metro stops due to the expense of digging tunnels to there. In contr…
Every now and again I look at the 1960s photos of the implementation of the metro system and the main idea that I take away from it is that something of that scale is pretty much impossible today.
https://www.flickr.com/photos/archivesmontreal/sets/72157664...