43141 runs slowly along the up relief line past milepost 62 near Denchworth, before coming to a stand at Wantage Road on 14 July 2011. It remained at Wantage Road for forty minutes, being overtaken by numerous service trains. Presumably therefore an ECS working, similar to the one I saw travelling in the opposite direction less than an hour before. These relief lines are seeing quite a bit of HST activity recently!