Shameless plug, but I just recently built my own little simple MTA app because I wanted to play around with Live Activities in Swift [0] to be able to display the next upcoming train on the lock screen of my phone: https://apps.apple.com/us/app/mta-tracker/id6477849271?platf...

(There are some annoying technical kinks with this that I'm still trying to iron out, but maybe someone will find it useful in the meantime!)

[0] https://developer.apple.com/design/human-interface-guideline...