Originally Posted by
Expressflight
Regarding early and late trains - yes, it's likely they will be in the timetable coming out soon.
Whilst I will always defer to your knowledge of aviation, Greater Anglia's May timetable is out and the last London bound train remains 23:05.
The last Tfl (Crossrail service) from Sheffield departs 23:44. We will have to wait until services through London commence to see if running hours are extended, if that happens I could see a later shuttle service between Southend and Shenfield.
Just to add this: The first train from London will arrive at 06:31 in the new timetable.
As said previously, timetables are developed in May and December. Any changes introduced between are just technical - add a minute here, take 30 secs away elsewhere.