Since the timetable update in January, there don’t appear to be any tube services in the API feed for outer rail services on the Central line Hainault loop:
I can only ever see Inner rail services in the feed - Hainault TO Woodford.
There are no services showing Woodford TO Hainault.
There’s another issue too - those that do show up are labeled “Grange Hill via Woodford”, but they either terminate at Woodford (and thus disappear before arriving) or go out of service at Woodford and continue empty to Hainault depot.
This affects Roding Vally, Chigwell, Grange Hill on the Central Line.