ROBEL Bahnbaumaschinen in Germany has supplied eight type 69.70 Mobile Maintenance Systems (MMS) to Network Rail as the infrastructure company strives to improve the safety and working conditions of track maintenance personnel.
Delivered in 2015-18, each set consists of a Mobile Maintenance Unit (MMU), Intermediate Car (IC) and Traction Supply Unit (TSU).
Nos. are DR 97501-508/601608/801-808. Alternate EVN identities are: Nos. 99 70 9481 001-4 to 008-9, Nos. 99 70 9559 001-1 to 008-6 and Nos. 99 70 9580 001-4 to 008-9.
The MMU is equipped with a variety of track maintenance tools, interior lighting and adjustable sidewalls that can be extended outwards to give an extra 60cm of working space. This is fully enclosed and floorless, offering protection from passing trains and inclement weather.