Stagecoach routes A and D operate a core route from Trumpington Park-and-Ride site, Addenbrooke's Hospital, Cambridge City Centre, and Cambridge Science Park, and St Ives . The Monday to Saturday off-peak timetable has four buses an hour (one per hour operating via Cambridge North Station as service D), where one bus starts from Royston prior to Trumpington . During the weekday rush hour there are up to 15 services per hour between St Ives and Cambridge, with additional services on routes from Chatteris, Ramsey, Somersham, Boxworth, Brampton and Godmanchester to Cambridge or Cambridge Railway Station. There is no service after the early evening, and on Sundays service D runs half-hourly from St Ives to Cambridge during the daytime.