Frustrating MBTA commuter rail experience as no ticket booths open late, no card transactions on board train, and no online sales, only an app that doesn't work on my phone.
But crisis averted as the staff practice (or at least did tonight) benevolent negligence: telling you sternly that you need to get off at the next stop if you can't pony up enough cash or figure out how to install the app, and that they'll be back to check on you in a minute.... and then never returning.