Case Studies

Gravesend Station Remodelling



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Gravesend railway station serves the town of Gravesend in north Kent. The station is 24 miles from London and the train services are operated by Southeastern Rail.

The station is situated on a major commuter line into / out of London and the High speed HS1 services to London St Pancras International were introduced in December 2009. The station is now seen as a major interchange for metro and high speed services. There is also potential for the Crossrail project to be extended to Gravesend.

The station’s remodelling will allow 12-car trains to stop at Gravesend which would provide up to 3,500 extra seats and more space for passengers.

The Team
Client: Network Rail
Contractor: C Spencer Ltd
4D Consultants: Oakwood Engineering / Schofield Lothian

Project Summary

Scope of Works

  • Value: £19.137m
  • Remodel track layout throughout the station
  • Remodel signalling layout throughout the station
  • Construct a new Island Platform & Canopy
  • Extend existing Platforms 1 & 2
  • Remove the existing footbridge and water tower base (Pre-blockade works)
  • Construct a new AfA compliant footbridge with lifts serving all platforms (Partial pre-blockade works)
  • Modular Control System (MCS inc TD & SPAD alarms) changes at Ashford IECC
  • Solid State Interlocking (SSI) changes (NG & NH) interlocking areas
  • Cab Secure Radio (CSR), GSM-R and ARS changes to reflect new layout
  • Interface with CTRL Route Control Centre System (RCCS) for services to HS1
  • Enhanced Station Systems (PA, CCTV, DOO, CISS etc.) 

Blockade Volumes

  • Total new track – 982m
  • Total new sleepers – 1060
  • Total new ballast - 5000m³
  • Total conductor rail realigned – 400m
  • Total conductor rail renewed – 1463m
  • Total number of S&C - 1 Turnout (2254 Point No., CV Switch, IBCL, Concrete Layout)
  • Total length platform extensions – 120m
  • Total length of new island platform – 275m
  • Total DOO cameras and screens: Recover 25 DOO Monitors and install
  • 32 Monitors and Recover 13 Cameras and install 20 cameras 

Selection of 4D Modelling for Gravesend Station

The project team felt a requirement to embrace new techniques given the complexity and high profile nature of the project. The emphasis and primary purpose of the 4D Virtual Construction Model was to de-risk the 15 Day Blockade in terms of construction/build as well as a tool to enhance the ‘standard‘ safety measures to protect the workforce.

Scope of Works

A joint venture team of Oakwood Engineering and Schofield Lothian were appointed to undertake the works. With only 2D data available, the following formed the scope of works:

  • Carry out detailed laser scan survey of the station to capture existing state:
  • Create 3D model from the laser scan data.
  • Source Lidar survey model of the Gravesend area:
  • Integrate all 3D data with the P6 programme using Synchro Software:
  • Review 4D model and report conflicts.
  • Facilitate model based project review meetings
  • Facilitate model based safety review meetings.
  • Maintain the 4D model in line with programme revisions.
  • Create snapshots / animations to inform project stakeholders, the train operating companies (TOC) and the public.
  • Provide onsite training to the project delivery team.

See attached case study for further information.