Bounty of Blood - Mission: OFF THE RAILS - forgot to talk to the conductor

Hello. Yeah I forgot to talk to that guy after killing the big monster and jumped on back to the main path. It seems impossible to get back there. So I can’t go on with the main story… I am totally stuck.

What can I do? That sucks :’(
Any advice?
Thank you in advance.

You can walk the entire map like you did for the first time.