In a step towards Network Rail’s commitment to net zero, 1,150 yards of track have been replaced in south London.

In a UK first, they have replaced the rail with new, low-carbon, green steel rail, concrete, and recycled ballast. This also includes the use of biofueled trains, which will help them meet their targets as well.

Network Rail collaborated with Southern Renewals Enterprise (SRE) and its business partner, VolkerRail, to renew the section of the line between Forest Hill and Honor Oak Park.

The track has been thoroughly tested and has demonstrated that this sustainable option is viable.

They have chosen to alter their track, as a significant portion of their carbon footprint was a result of the materials involved in track renewals. The creation of sleepers, ballast, and steel rails is a carbon-intensive process, which accounts for around 90% of Network Rail’s footprint.

So how is this a solution?

Green steel rail is made in an electric arc furnace, with 605 less carbon intensity than blast furnaces.

A 40% reduction can also be found with the low-carbon concrete sleepers and a further 13% reduction using recycled ballast, as there is less need for virgin aggregate.

The biofuel used in trains is relatively self-explanatory, along with their solar-powered welfare units, which cut emissions and reduce the need for diesel generators.

A total of 63% reduction has been made through the combined innovative efforts.

This method will gain momentum and will be used across more SRE projects.

The efforts made at Honor Oak offer a practical example of how railways can be more sustainable.

“This project shows what’s possible when innovation and teamwork come together. It’s the first of many greener renewals we plan to deliver – helping us move steadily toward Network Rail’s net zero goals.”

Dave Sutton, SRE Track’s Project Lead