Buses replace trains between Manchester Victoria and Ashton over the Easter weekend on Friday 3rd, Saturday 4th & Monday 6th.
A revised timetable will be in operation with trains running between Huddersfield and Ashton only.
http://www.northernrail.org/pdfs/trackworks/0110a_Huddersfield-Manchester.pdf
Although the timetable shows connecting buses at Stalybridge & Ashton, it may be quicker and more convenient to change at Stalybridge on to an express to Piccadilly (5 minute connection towards Manchester, 3 to 5 minute connection coming from Manchester).
On Sunday 5th there’s a different revised timetable with trains running between Huddersfield & Stalybridge only.
http://www.northernrail.org/pdfs/trackworks/0102a_Huddersfield-Manchester.pdf