CN... you're on the very right track!!! It's clicking for you... I see it in your post, even if you dont!
Eliminating enabling is about living and let living. It's not doing for others what they can and SHOULD be doing for themselves. When we make a mistake, there are consequences for it. You pay a bill late, there's a fee or penalty. When you drink and drive, you get a DWI - you can lose your license. If you lose your license, you can't drive. You can't drive, you don't work. You can't work, you don't have money.
There are all sorts of things that can happen to us and everyone around us. What happens in an alcoholic/codependent relationship is life gets out of balance. We the codependents intercept the "consequences"... for a whole host of reasons, but the largest and simplest is that we think we are helping. The reality is we are preventing them from living their life and dealing with the consquences of their choices (enabling).
It's completely up to you what you want to do about the train rides. Don't overthink it too much...lest you'll spin your wheels and not move forward. Small steps are better than no steps.