We didn't drive the TT around the National Park section of the Cabot Trail. We had camped 2 days in Baddeck, then did the South portion of the Cabot Trail to Chéticamp. Parked there for 3 nights and did the Cabot Trail - National Park section back and forth with the Sierra only. It's less stressful and more enjoyable this way. Plus you can't always stop everywhere you want with the TT on that road!
Woodhaven is in Hammonds Plains (North-West of Halifax), we camped there 2 nights, and we never heard any train go by, but then again we didn't spend much time in the campground (aside from the sleeping period!!!). However, looking at Google Maps, I don't see any railroad tracks nearby!
2014 JayFlight 28BHBE (replacing a 2009 Kodiak 25QS)
2011 Sierra SLT CrewCab 4x4
1200/12,000 Equal-I-Zer Hitch