In the sidings with the stored locos but still off York at the time.
This loco spend time in store from 20 June 1963 until its withdrawl in May 1964 and this is recorded as at York shed, but clearly it was not the case for at least some of that period.

It was one of the V2s sent to Swindon Works for the conversion of their tenders to snow ploughs and the rumour is that the ER offloaded the engines as well as part of the deal.