Well I would suggest going to whatever station it is and having a look round. Speak to the STM if possible. Speak to whoever is working and ask them about the job to get an idea of what's involved day to day.
Are there train dispatch duties? If so find out which trains you would be dispatching.
Find out some things about the company, who the managing director is, maybe something about the Scotrail Alliance.
I'd go with that for starters.