MQT on 2017-02-20
Session date: 
February 20, 2017
Question By: 
Andrew Dismore
Labour Group
Asked Of: 
The Mayor


Is it correct that there is no electric-powered rail-mounted rail-grinder small enough to be used in the Northern Line tunnels, thus preventing corrugated tracks being smoothed out, when compared with other lines where a diesel powered rail-grinder can be used; and if so, what can be done about this?


Answer for rail-grinders

Answer for rail-grinders

Answered By: 
The Mayor

TfL has allocated funds in its Business Plan to develop its own electric-powered rail grinder unit which would be suitable for use across the entire Tube network. TfL is aiming for this unit to be in service in 2020/21. 

TfL currently contracts the most modern and efficient diesel-powered grinding machinery available. Some limitations remain due to the age and geometry of some of TfL's infrastructure. In these locations, TfL uses a variety of methods to manage rail condition and reduce noise, such as replacing rails and installing shock absorbent track fastenings.