If you haven't visited the New Brunswick Railways site yet, head over there now. I'll wait.
Seriously, the site is a great advertisement for New Brunswick's many railway attractions and a good resource for those looking to learn more about NB's railway history.
You can click on the interactive map to go to a specific "trail" such as the Upper Saint John River track, featuring Bristol, Edmundston and of course McAdam among others.
Check it out!... en Francais!
Disclaimer: I was involved in this project back when I still lived in New Brunswick. That's my photo of the Salmon River viaduct on the bottom of every page. :)