 In late 1871 the residents of Brill , the former seat of the Mercian kings and the only significant town near Wotton House , petitioned the Duke to extend the route to Brill and to run a passenger service on the line . In January 1872 a passenger timetable was published for the first time , and the line was officially named the " Wotton Tramway " , but it was commonly known as the " Brill Tramway " from its opening to passengers until closure . The new terminus of Brill opened in March 1872 . With horses unable to cope with the loads being carried , the Tramway was upgraded for locomotive use . The lightly laid track with longitudinal sleepers limited the locomotive weight to a maximum of nine tons , lighter than almost all locomotives then available , so it was not possible to use standard locomotives . Two traction engines converted for railway use were bought from Aveling and Porter at a cost of £ 398 ( about £ 32 @,@ 000 as of 2016 ) each . The locomotives were chosen on grounds of weight and reliability , and had a top speed on the level of only 8 miles per hour ( 13 km / h ) , taking 95 – 98 minutes to travel the six miles ( 10 km ) between Brill and Quainton Road , an average speed of 4 miles per hour ( 6 @.@ 4 km / h ) . 
