I haven't seen any either!

I travelled on the line today. I arrived at Leyton Midland at 11.04,
four minutes after the previous train had left. A class 59 with 26 on
came through the station towards yellow signals at about 25 mph.
Bearing in mind the preceding passenger train will stop at
Walthamstow Queens Road but the freight train won't, there's not
much slack in the system.

The good news is they've fixed the public address system on Platform
2 at Blackhorse Road!