There is one bus driver from Comber who took me and 116 (ROI 116) from Downpatrick to Comber via Shrigley one morning a year or two ago and he used nothing but the top 3 gears for the whole journey. It was awful.
There are some very steep hills on the way to my school and sometimes drivers got a Leopard down into the very bottom gear if we had to start on a hill.
Ardglass & Strangford have 2 duties and drivers; Saintfield has 3; Downpatrick has something like 26 duties---I used to know but forget. Buses: Ardglass 1032 (JXI), 1194 (NXI) Strangford 1368 (UXI), 1195 (NXI) Saintfield 2774, 2775, 2777 (all BCZ ex Citybus)