Great Start....

Very excited the Metrolink introduced this app. Particularly because their ticket machines are often broken or very slow. Having said that, there are few critical features required before this app can be considered mature.
Schedules! Schedules that account for weekends and holidays.
Remember me. Stop making me login every time I use the app. Remember me or use touch ID.
Wallet support. Not quite required, but nice to have.

StubbornlyWrite about Metrolink, v3.1.3