120 leads a Cockfosters to Hatton Cross service into Hatton Cross. This is actually a Heathrow Terminal 4 service in the timetable, but
as Terminal 4 was not open, the train terminated at Hatton Cross and ran empty round the Terminal 4 loop and then re-entered service
at Heathrow Terminals 2 & 3.

Date: 11 April 2021
Manipulation Notes: None