That’s the tough part; it’s self-reinforcing :) both are causes and both are effects, and we’ve got to break the cycle somewhere.
But no, all of them. Low usage causes service cuts, which cause low usage because you can’t rely on transit, causes delays because there isn’t enough service to make up for failures and there isn’t enough investment for grade separation and maintenance, etc
But no, all of them. Low usage causes service cuts, which cause low usage because you can’t rely on transit, causes delays because there isn’t enough service to make up for failures and there isn’t enough investment for grade separation and maintenance, etc