We left Colmar by train on a forecast rainy day and did a 3 train hop to Nevers during which it rained very satisfyingly hard. It made me very happy to hear that rain pelt the train windows while we were warm and dry inside.
Train travel tip with bikes: always leave super early to ride to the train station, you never know what will suck up that extra time. So far we’ve had: crowded market day along the route, broken elevators requiring unloading and carrying bags and bikes up and down stairs, massive construction projects leading to circumnavigating the entire station, and uncooperative ticket machines (we usually book on line but the website was down.). So pad that trip with extra time. The worst that happens is that you’re early and get to hang out on the platform wondering which carriages will have the bike logo on the side – near where you’re standing or a trot down the platform?
We’ve found the local French trains, Ters or regional, reliably have a bike car at the front of the train, and usually at least one if not more further down. If you’re really not sure where the bike space will be, figure out which way the train is traveling and stand at the end of the platform where the train arrives. You’ll be able to see the marked bike cars and can always run down the platform if you need to.
Another good tip is to make sure you can take your panniers off quickly, not only to make the bike lighter to lift up stairs, but to be able to stack the bikes efficiently in the bike area. Also so that you can do a quick bag removal, toss the bags into the train and then lift your bike in all while panicking that the train will try to leave without you. The station at Nevers did not have ramps or elevators, us and three other cyclists did the unload bags, carry down carry up, wondering aloud what people with mobility issues would do. We found the answer to that question, which is hail a member of staff and they will help you cross the tracks at the end of the platform. Strictly prohibited for general use. Of course, we were also told that finding a member of staff can be difficult, but now we know.
We rolled out of Nevers and started the Loire River Eurovelo Route 6, heading west.
One of the joys about not having to plan too far in advance, or being so busy sorting out places to stay, so that we don’t really know what’s coming up, is being surprised by something like the Pont Canal de Briare.
We may push on to the Atlantic Ocean, or we may not. There are more Châteaus to see and more wild river to enjoy. Happy pedaling.
Less Car, More Life 
What a great write-up! I could practically hear the rain falling as I read this. Beautiful!
Thank you! It’s been hard to find time to write, so much to see and do.