Extending subway tunnels by 41 miles would cost many, many billions.
The problem is that people don't see public transit as a public service, and instead see it as a source of revenue, which is crazy. You don't build public infrastructure expecting direct monetary returns on the investment. The returns are indirect, but they are there.
Having two locks including a proper deadbolt with a decent type of key. You want a deadbolt that goes deep into the door frame, not a cheap one that barely hits the strike plate. That and locking windows with window film will keep most people out.
Nothing will keep someone out who really wants to get in. You just need to make the hassle greater than their desire to get in.
Extending subway tunnels by 41 miles would cost many, many billions.
The problem is that people don't see public transit as a public service, and instead see it as a source of revenue, which is crazy. You don't build public infrastructure expecting direct monetary returns on the investment. The returns are indirect, but they are there.