I and 7 colleagues too a trip to York yesterday, 6 of us travelled from West Yorkshire, and the ticket sales were interesting. We all left around 10am to meet in Leeds for about 10.30. I used a machine at New Pudsey. Off peak day return. No restriction. Colleague used a machine at Apperley Bridge. Off peak day return. Northern service only. Ticket office at Keighley. No restriction On train from Batley no restriction Trainline app. No restriction. Off peak with senior railcard from Steeton. Northern restriction. None of us chose the particular Northern restriction as we weren't aware of it, so why the randomness?