Holytown Junction to Midcalder Junction (H2M) (via Shotts)


The Holytown Junction to Midcalder Junction (H2M) (via Shotts) Electrification Scheme has contributed to the transformation of services across the central belt. By enhancing rail travel between the country’s two biggest cities Edinburgh and Glasgow, the project has created shorter journey times for passengers, increased capacity and better reliability.

Kelly Rail supported the electrification of 74km of railway as part of a wider programme to electrify the whole Edinburgh to Glasgow route. This was the first electrification scheme to be delivered in the UK on programme and to budget.

Services Delivered:

To provide the required overhead line power supply of 25kV three new Track Sectioning Cabins (TSC’s) were installed at the following locations:

  • Holytown
  • Shotts
  • Addiewell

In addition, extensive modification works were required at the Midcalder TSC site.

Delivering multi-discipline high voltage (HV) and low voltage (LV) power, civils and track associated works, Kelly Rail provided installation, testing and disconnection services which included:

  • Installation of HV cable trough route (ground and elevated) from the track section cabin (TSC) perimeter fence line to the allocated lineside Track Sectioning Switch (TSS)
  • Installation of an under-road crossing (URX) for HV traction cables at Addiewell
  • Installation and termination of both ends of the new 120mm² HV traction cables from the TSCs to the allocated lineside TSS
  • Testing of the new installed HV traction cables and production of test results
  • Final connection of the new HV traction cables at the TSC ends only

As the H2M site works and detailed design evolved, scope gaps were identified. Working in collaboration with SLP Powerlines, Kelly Rail proactively addressed these and carried out additional works:

  • Bonding – lineside structure and track bonding works
  • Stations - tmporary circuit protective conductor (CPC) bonding to all existing structures
  • Lineside fencing to mitigate potential and fence line continuity gapping
  • Isolation transformer and GRP cubicle – Holytown TSC site
  • Bridge ferro scanning works – Holytown junction

Key success factors:

Maintaining the same core site staff throughout the programme enabled close working relationships to be developed which resulted in constant workflow delivery with change management identified, captured early and agreed by all stakeholders.



SPL Powerlines