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I think the slow trains in France are a bit better. They are in Germany, I've got around by train fairly easily there. You can even generally blag on to ICEs with no bike spaces left if you take wheels off and put your bike in a bin bag. I've seen people doing that on the platform in France too - just it's different rules for each TGV line.
But flying is 100x easier to plan. And forget trains if you want to go east of Slovenia.
Good that they have any at all but 3 spaces sounds risky - just need a family to wipe it out...
Book early I guess.
I agree about France and the TGVs, but I always thought that it will be ok if you stay off the TGVs, no?