As long as we do not have any english entry here I like to lead you to a nice help, I found at the formal Train Fever website.
It is written from a third party, named "douglas", and hostet on a separate server.
You can find the link to the TRAIN FEVER INTERACTIVE GUIDE at the official Train Fever community page:
http://www.train-fever.com/for…-fever-interactive-guide/
Use at your own risk.
Cheers