My research shows to get from London Euston to Watford Junction, I can either take the West Midlands train or the London Overground.
Are these two different lines/services?
If the train costs £13.40 one way (per National Rail) and using an Oyster Card costs £7.20, why wouldn't I use an Oyster Card (or credit card tap in/tap out)?
So I'm confused. Do I show up at Euston and just tap in somewhere with my oyster card and take the train to Watford Junction and tap out?
Or do I purchase a train ticket for £13.40 and board the same???? train that's going to Watford Junction? Or is it a different service?
And then, let's not confuse me further with a 2 for 1 rail ticket or Day out pass. ( I'll research that seperately for train ride to Bletchley)
Thanks in advance for giving me correct information