STONEBLOWERS

Railtrack is to spend £21m on eight Stoneblower computer-controlled track maintenance units over the next two years. The Stoneblowers, developed and manufactured by US firm Pandrol Jackson, measure the alignment of stone ballast under tracks to an accuracy of 0.5mm and inject small stones to fill any spaces. Tamping methods of restoring track alignment tend […]

Railtrack is to spend £21m on eight Stoneblower computer-controlled track maintenance units over the next two years. The Stoneblowers, developed and manufactured by US firm Pandrol Jackson, measure the alignment of stone ballast under tracks to an accuracy of 0.5mm and inject small stones to fill any spaces. Tamping methods of restoring track alignment tend to destroy ballast, Railtrack said, whereas its new machines will leave ballast largely unharmed, making restoration work last longer.