The first West Highland Line ‘Sprinter’ unit to be fitted with a controlled emission toilet (156 485) has now entered service on the routes to Oban, Fort William and Mallaig. A programme is underway to fit all ScotRail Class 156 DMUs with toilet retention tanks for this purpose by 2017, as opposed to the current system where toilet waste is released onto the track. Work on the units is expected to be slow at first until the efficiency of the equipment is proven, after which the programme should gather more pace.
The Metro-Cammell-built Class 156s were first introduced onto the West Highland Lines in 1989. In 2018, they are planned for replacement by the later-built Class 158s.
(Photo Copyright Nick Jones)