Erdington rails

Usually i go out of Birmingham to do some train photography, i certainly have never done a proper photo shoot at my nearest station Erdington before mostly because it is usually a commuter station with a parade of 323 EMUs and little else. However this morning i saw on RTT that there were a few different workings going through the station so went along to take some photos. I've never seen a HST go through Erdington before and also never seen a Rail Head Treatment Train in operation until now. You can see the photos i took here.