This is magnificent. I haven't tried it out yet, so I'm obviously jumping the gun—but that is exactly what I'm working through in my head every time I get on an

This is magnificent. I haven't tried it out yet, so I'm obviously jumping the gun—but that is exactly what I'm working through in my head every time I get on and off the subway. N -> L is an easy one. I'll let you know what I think but this is an app that's very much in line with my own obsessive concerns.