Ultracycling

How did you get to Zagreb and what did it cost? Were they much possibilty damaging the bike in a Rinko bag?

I just did what he said:
https://www.seat61.com/Croatia.htm#london-to-zagreb-by-train

It all worked more or less to plan.

Also got a local train from Zagreb to the Bosnian border. Croatian trains are excellent for bikes.

I could have damaged my bike if I hadn't packed it up properly, dropped it, etc - but no-one else touched it, so all risks were under my control. My biggest concern was losing a critical bit when rebuilding on the platform at Zagreb, and I think I managed to leave my (cheap) watch there.

If I was doing it again I would get an interrail pass, but didn't think of it this year so probably paid slightly more - can't remember exactly what.