172 102 having been drawn out of the wall siding at Marylebone to take part in the launch ceremony, the other two units were still stabled there, 172 104 visible here and 172 101 hidden by 165 029 in Platform 1. The fourth 172/1 unit is presently in use for driver training runs. 15:00, Friday 15th July 2011. Digital Image No. GMPI9734.