Watched it a few times before too, cringeworthy dialogue and exaggerated accents but the railway operation contents are invaluable to modellers of this era.
Did anyone see the LNER 12 ton fitted Fruit van about a third of the way in... I tried to catch the full number but the first bit was obliterated with chalk marks.
If you mean at about 7:49 one partially obscured looks like a 5 so last 5 digits would be 50534. does that help?