Northern Line - Ride Quality (4)

MQT on 2015-03-25
Session date: 
March 25, 2015
Question By: 
Andrew Dismore
Labour Group
Asked Of: 
The Mayor


Do your engineers hold speed and acceleration data for the same sections of track, from earlier driver-operated and current automatic operation? Have they ever made a comparison? With what result? If the former quality of ride was deemed subjectively 'acceptable' by passengers, how would you describe the current situation?


Answer for Northern Line - Ride Quality (4)

Answer for Northern Line - Ride Quality (4)

Answered By: 
The Mayor

Yes, London Underground's engineers have records of actual train 'Run Profiles' from before and after the re-signalling.  As mentioned in my response to 2015/0948, the train performance has changed considerably.  Any comparison will show that the trains are accelerating substantially faster, are running at higher speeds, are following the permitted line speeds more closely, and have a reduced inter-station run times enabling a faster and more frequent service. The current ride quality is in line with the other modern signalling and train systems deployed on the Underground delivering a similar level of performance to the upgraded Northern line.