Mobile Maintenance Train

Short description: British Departmental Engineering Train

* Mobile Maintenance Train (MMT)
* DR975 / DR976 / DR978

6U81 in Darlington Down Sidings

In service| 2015 - Present
Manufacturer| Robel
Built at| Freilassing
Family name| ROMIS SYSTEM
Entered service| 2015-present
Number built| 8
Number in service| 8
Formation| 3 cars (DM+T+DT)
Fleet numbers|

* DR97501—DR97508 (motor cars)
* DR97601—DR97608 (trailer intermediate cars)
* DR97801—DR97808 (trailer cab cars)

Operator(s)| Network Rail
Depot(s)| Darlington

Paddock Wood Derby Woking Retford Romford Peterborough

Horsham
Specifications
Entry| step
Articulated sections| 3
Maximum speed| 60 miles per hour (97 km/h)
Prime mover(s)| 2 × Deutz engines
Power output| 500kw
Track gauge| 1,435 mm (4 ft 8 1⁄2 in) standard gauge
Stock type| on-track plant diesel multiple unit

The Mobile Maintenance Train (MMT) is a series of on-track plant diesel multiple units constructed for Network Rail by Robel.

## Contents

* 1 Formation
* 2 Purpose
* 3 History
* 4 References
* 5 External links

## Formation

Each Mobile Maintenance Train consists of three cars permanently coupled together to form a singular unit.

Unit  | Description  | Comments

|
|

DR97501-DR97508  | Traction Supply Unit  | staff mess, toilet, workshop, traction power, driver's cab
DR97601-DR97608  | Intermediate Car  | storage and loading area
DR97801-DR97808  | Mobile Maintenance Unit  | enclosed working space with walls providing separation from passing trains, driver's cab

Each Unit also has a unique headcode that remains assigned to it at all times, to identify the unit as a whole, 6U81 to 6U88. Traction and onboard power is provided by a pair of 500kw Deutz engines and the working area within the MMU is 16m x 3m, with extending side walls providing upwards of 1.2m of space when needed.[1]

## Purpose

The MMT was introduced in order to introduce a "Workshop on Wheels" for track workers as they conduct maintenance activities across infrastructure controlled by Network Rail. Maintenance activity can be conducted from within the train itself, with the Mobile Maintenance Unit providing separation via the use of containing walls, providing a physical barrier between workers and potentially open lines beside them. The Intermediate Car provides a storage space for Workers to bring tools and materials required for tasks directly to site, with a pair of 2 ton gantry cranes that run the length of the IC and MMU allowing for the moving of heavier equipment such as lengths of Rail. Side Walls on the IC can be lowered allowing the train to be loaded by Forklift. And a welfare facility housed in the Traction Supply Unit provides staff a place to both complete paperwork and take breaks.[2] The MMT was estimated to create savings of over GBP 1 Million per year in maintenance costs.[1]

## History

The project commenced in February 2013,[1] and the first examples were unveiled in 2015, with the first unit, 6U81, entering service based out of Darlington Depot, followed by the second and third examples based at Paddock Wood in Kent and at Derby, with later examples being based out of Woking, Retford, Romford, Peterborough and Horsham.[3] In April 2020, Harsco Rail was awarded a 3 year contract to maintain and operate the fleet with a two year extension option, a contract valued as being worth USD 25 Million.[4]

## References

1. ↑ 1.0 1.1 1.2 Grey, Eva (2016-02-25). "Mobile maintenance: Network Rail's workshop on wheels" (in en-US). https://www.railway-technology.com/features/featuremobile-maintenance-network-rails-workshop-on-wheels-4696850/.
2. ↑ "Network Rail unveils its 'workshop-on-wheels'". https://www.imeche.org/news/news-article/network-rail-unveils-its-'workshop-on-wheels'.
3. ↑ "Britain's first 'workshop on wheels' set to revolutionise railway maintenance" (in english). https://www.networkrailmediacentre.co.uk/news/britains-first-workshop-on-wheels-set-to-revolutionise-railway-maintenance.
4. ↑ "Network Rail awards mobile maintenance trains contract to Harsco Rail" (in en). https://www.globalrailwayreview.com/news/98300/network-rail-mobile-maintenance-trains-harsco-rail/.

## External links

Template:Network Rail Departmental Multiple Unit Classes

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