Horsham Field Depot
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Horsham Field Sidings
Location Project Date Client
London June 2013 - October 2016 Carillion
The new-build £13m Horsham Field Sidings is part of the Thameslink Programme, a £6.5bn government-sponsored project that includes the transformation of north-south travel through central London.

The Horsham Field Sidings is a new stabling facility in Horsham, West Sussex, where the Thameslink rolling stock will be cleaned and maintained.

BCS Design was commissioned to undertake a GRIP stage 4 and 5, a single option development and detailed design respectively.

Horsham Field Sidings was divided into different phases including:

- 6 No. sidings 300m long with a reinforced concrete walkway between each siding, a driver’s walkway and Controlled-Emission Toilets (CET) walkway.

The driver’s walkway was a route for train drivers to walk along and inspect the train.

The CET walkway was used for the extraction of train waste and pumping new tanking water into each train via CET pumps.

The civil design included the design of the reinforced concrete walkways, track drainage, cable management sleeper location, DC cable containment to the existing substation, pad foundations, ballast board retaining walls and surface drainage (piped and ACO drains).


- New pipe jack Under Track Crossing (UTX) for the DC cables to serve Horsham Field Sidings from the existing Horsham substation. Consisted of a 2m diameter concrete surround pipe jack 60m long located beneath 8 No. operational railway lines.


- New Maintenance Delivery Unit (MDU) to accommodate Network Rail staff (signalling and track workers). This included a new single storey modular building re-using existing concrete slab and new pad/raft foundations. The area for the new MDU accommodated existing and new containers (various equipment) including storage for gas cylinders. Other civil design elements included surface and foul drainage, gabion wall design, pad foundation design for the containers lighting and CCTV column equipment.


- Train Operating Company (TOC) building – destined to First Capital Connect (FCC), the TOC for the sidings. The project involved refurbishing an existing modular building which included architectural, mechanical, electrical and telecoms design. The proposed room layout was based on FCC requirements in conjunction with building regulations i.e. fire strategy, DDA compliance, etc.


Being part of the Thameslink Programme, BCS will help in the improvement of rail journeys across London.