On an overnight visit to Brum, I spent 14:00 - 15:30 yesterday, and 07:30 - 08:30 (roughly) sitting at Tyseley. Between those two fairly short sessions, I managed to see all the 172/2 and 172/3 series units (as well as a remarkable mount of other stuff). They were all on service duties. This, to me, seems like remarkable availability, even for a relatively new class, and is a tribute to the maintenance. Any thoughts?