Screenshots

It looks like the one from the top of the old Kop was probably taken, when the ‘new’ Midland Road’ cover was erected. So probably around 1966 and certainly before 1968 when steam trains ceased to operate.

The investigation resulted in the closure of half the Midland Road stand. The stand's steel frame was then sold to Berwick Rangers for £450 and a smaller replacement stand was built at Valley Parade in 1954.[21] Six years later, the stand had to be demolished for a second time because of continuing foundation problems.[22] It was another six years before all four stands at Valley Parade were able to be opened for the first time. To enable construction of a new stand on the Midland Road side of the ground, the club directors moved the pitch 3 yards (2.7 m) closer to the main stand. The new stand was then the narrowest stand in the league.[22] https://en.wikipedia.org/wiki/Valley_Parade