sentences:  Accordingly they had the most modern motive power and rolling stock available.They were initially hauled by members of the first J class and limited to a speed of 60km/h, resulting in a journey time of eleven hours, but the timetable was accelerated with the introduction of the Rogers K class.The K locomotives could achieve speeds of up to 90km/h and they helped to quicken the schedule, with the T class handling the train on the hilly section between Oamaru and Dunedin.