(24 Feb 2015, 12:10 am)Racer_Experience wrote Can anyone confirm this question is a Gas Bus an odd working for X1 to Doxford Park to Sunderland only I saw one todaySome runs are operated by gas buses, interworking with service 13.
Others interwork with service 4, so if a gas bus appears on one of the runs attached to the 4 service, it would have been an odd working.