RTT wouldn't show unplanned trains, but they are visible on Open Train Times (OTT) live maps, and only 125 was diverted to Sunderland pre-concert. 107 also ran an extra trip to Sunderland instead of coming out of service in the evening, and 164 also appeared which wasn't showing as a planned train in RTT.
Post-concert there were 9 additional trains (171-177, 181, 182) some of which ran 2 journeys to and from Sunderland, and the Metro Twitter page was posting that crowds were cleared well in advance of the last train... no yellow line trains were seen on OTT post concert
I guess pre-concert will have been affected by the peaks not running which would normally be able to at least pick up people travelling in the central corridor
Post-concert there were 9 additional trains (171-177, 181, 182) some of which ran 2 journeys to and from Sunderland, and the Metro Twitter page was posting that crowds were cleared well in advance of the last train... no yellow line trains were seen on OTT post concert
I guess pre-concert will have been affected by the peaks not running which would normally be able to at least pick up people travelling in the central corridor