Caltrain Droid is the top Caltrain app for Android.

Features:
- No network connectivity required
- Fare and Baby Bullet trains clearly indicated
- Information about timed transfers
- Spinner lets you quickly choose stations
- Next available train is highlighted
- View times, train numbers, and duration
- Easy access to Twitter live updates

From version Caltrain Droid 3.8.1:

Updates to include new Caltrain schedule effective October 7, 2019.

All versions
October 10, 2019
March 29, 2019
October 6, 2017
September 29, 2017