In a early edition of London railway record I think there is a pic of a DMU at woodford, and in a On-line LT video there is a short clip of a steam loco again at woodford
I was born in Leytonstone in 1956 and I do remember being taken to the Grove Green Rd side of the LT station (the 236 bus stop side) to be shown an afternoon steam goods running up from Leyton.
I do remember the posters at Leytonstone about the ending of the early morning DMU service to Liverpool Street B.R
The 60's Underground guides do show the DMU service (passengers must be in possession of tickets) and BR timetables show the DMU's as starting at stratford no mention of coming from the LT branch.
Somewhere on the net is a website about signal boxes and the Leyton box has a mention, it also talks about the eastbound platform at Leyton used as a heatshunt for Leyton goods/ coal dept and all LT trains to and from London using the westbound platform while shunting took place
I guess the 2 long loops tween Leyton and Leytonstone were used to hold goods trains till a path was free
A guy I used to know was a bit older than me and he remembered getting a train from South Woodford to somewhere like Ramsgate on a summer Sunday
The train ran down to LP Street BR reversed and ran over the ELL and over the southern
The whole subject of goods over LT tracks would make a great book