Glad he enjoyed them! Oh, and Thomas is actually blue, though a little different to this loco.
Left-track running is the norm: In the fifth pic that's the rear of a northbound train just leaving the station that you can see on the left track. There are a few places where right-running takes place due to complex track arrangements though.
There is still a stretch of single-track branch line in this area as well, complete with grade crossings ("level crossings") where you have yo get out, phone the signalman to check the line is clear and open the gates yourself. I'll get some pics of that one for you next time I'm over that way.