By traction I mean new units...not difficult isn't that one, mind! Most of the ones we had were 377's, and a couple of Turbos.
I haven't done that much, but, to be annoying, in the one go have done the Littlehampton and Bognor branches and been on the platform (and out of the station) at Redhill! A couple of days before I also did Southampton to Cosham (and beyond) via St Denys and goodness knows where.