Strawberry Hill Depot

In preparation for the increase in rolling stock and additional berthing requirements, Cleshar was awarded the contract to extend two of the existing sidings at Strawberry Hill depot and, in addition, successively secured the contract to carry out the DC power upgrade.


Cleshar’s delivery model was based on the ability to self-deliver the civils, permanent way, traction power, negative and positive cabling and track welding while making use of supply chain partners to deliver the mechanical and electrical package.


The initial phase of the works was delivered over a four-month programme within an operational depot environment. During construction, the depot remained fully operational with no disruption, safety issues or delays to completion. With the depot being principally a driver’s depot, the primary focus was to ensure that normal depot activities were unhindered during construction, ensuring that all customer staff needs were facilitated and disruption minimised.


This required close collaboration between the delivery team and customer, with good relations maintained throughout the works. Once the worksite was identified and agreed with the depot management team, the existing walkways were diverted and the segregated zones were set up, and the existing vegetation bund was excavated to the required level. Excavated spoil was transferred to a material laydown area which was then disposed of at a time least disruptive to the depot. The underlying formation was then built up using type 1 and compacted at 150mm layers. Excavation for additional lighting columns and bases was also required. Ballast, sleepers and the track to both roads were installed along with a set of points and two new buffer stops.


New walkways, LED lighting and the associated transformers, distribution boards and components completed the scope of this multi-disciplinary scheme.




London Underground

Project Value


Contract Start and Completion

August – October 2016

The scope of works for the alteration to the sidings
  • Recovery and removal of the two existing siding loops

  • Removal of an existing vegetation bund followed by the installation of earth retaining structures

  • Installation of the track formation project for the extended sidings, retaining walls and permanent way installation

  • Reconfiguration of traction power

  • Enhancements to depot lighting and associated walkways