When in doubt, always address your audience in a presidential manner:

“The award for best way to apologize for a track delay goes to #CalTrain,” @actualkris observed.

Oh, by the way, are you following us on @caltraindiaries? You can get a daily dose of commuter life in the Peninsula: cell phone convo that should require an NDA, tragically failed pickup lines, of course, toenail clipping.