One service is required in the other direction, departing Manchester between 1700 and 1759. Which oddly seems to suggest Manchester-Chester being half-hourly except at peak times.
Assuming the standard pattern ATW service remains at the same times I've worked out the Northern timings would be approx the below.
Chester arrivals at Manchester:
07:25
09:25
10:25
11:25
12:25
13:25
14:25
15:25
16:25
17:25
18:25
20:25
21:25
Ellesmere Port arrivals at Manchester:
08:25
19:25
Manchester departures for Chester:
06:20
07:20
08:20
09:20
10:20
11:20
12:20
13:20
14:20
15:20
16:20
18:20
19:20
20:20
21:20
Manchester departures for Ellesmere Port:
17:20
So I imagine ATW will still need to operate 1 extra in the morning peak in the Manchester direction and 1 extra in the evening peak in the Chester direction.
--- old post above --- --- new post below ---
Also looking at the TPE service I thought the so called semi fast TPE was to replace the stopper between Huddersfield and Manchester, but If I have understood it correctly it also replaces the Huddersfield - Leeds stopper, which makes it more of a semi-slow service rather than semi fast, also it looks to me that Dewsbury gets reduced to 3 trains per hour instead of 4 and also gets this semi slow service to Manchester instead of the current fast one, mean while we get 4 trains an hour only calling at Huddersfield is that really nessesary
The track access application submitted by TPE on the instruction of DfT was for the semi-fast services (2tph) to call at 6 stations between Piccadilly and Leeds - Guide Bridge, Stalybridge, Huddersfield, Dewsbury and 2 stations between Stalybridge and Huddersfield. However, as you say that seems to have changed.
It now appears Dewsbury will also be served by one of the express services every hour, with all the 'semi-fasts' calling at Stalybridge, Huddersfield, Batley and Dewsbury. While all the other intermediate stations between Stalybridge and Leeds will get half the 'semi-fasts' stopping there, except Cottingley, with no requirement for TPE to serve Guide Bridge. So in total 8 stops between Piccadilly and Leeds for each semi-fast service.