The Quaintonian charter shuttle service between Aylesbury and Quainton was revived for the August Bank Holiday Monday 2004 using Class 121 Bubble Car 55020. More details are normally available on The Railcar Association's website.

The same unit was also used on the Quaintonian charter shuttle service Aylesbury to Quainton for the 40th Anniversary weekend on the August 2009 August Bank Holiday Monday.