Up to the bidders for the next franchise to decide best use of stock, the franchise timetable requirement is an hourly service for Kirkby line stations to Manchester approx. 6am-6pm (not specifying route after Pemberton) with a written requirement for an additional Wigan-Kirkby service after 7:15pm, so 13 services per day Kirkby to Manchester and 14 Wigan-Kirkby. It also specifies that one service must leave Orrell towards Manchester between 3:45 and 4pm (for students).
There is however no requirement for Kirkby-Manchester services on Sundays.
60 services per day Wigan via Bolton
86 services per day Wigan via Atherton
13 services per day to Manchester-Kirkby +1 Kirkby-Wigan after 7:15pm
30 services per day to Manchester-Southport +1 Wigan-Southport after 7:15pm and 1 Southport-Wigan after 11pm