Hi hun,
First lots of

to you for ET

If the train is not an easy option, such as one fast train, maybe drive, can you stay 2 nights instead of one night , before driving back? ( you mention you would drive back the next day).
The main thing is no lifting of any kind, not even a suitcase. not even for 2 min, and not lifting your arms in the air, such as to catch something, or reach something.
Maybe when you drive back , you can take it easy and stop several times , then you should be fine. Stress is also to take into account and it sounds you would be less stressed in your car than in a train, having to change maybe trains and taking a bus, waiting in the cold...
So I would, I think , personnally drive .
Good luck!

Future Mummy