Northern Line - Ride Quality (2)

Meeting: 
MQT on 2015-03-25
Session date: 
March 25, 2015
Reference: 
2015/0947
Question By: 
Andrew Dismore
Organisation: 
Labour Group
Asked Of: 
The Mayor
Category: 

Question

In determining what acceleration or deceleration to apply to a train, does the new system have knowledge of how full the train is? Can the 1995 stock? Can the new sub-surface stock? Does the weight of any Underground train dramatically change the calculation necessary for typical desired braking and acceleration? Is this something the Northern Line system is unable to take into account?

Answer

Answer for Northern Line - Ride Quality (2)

Answer for Northern Line - Ride Quality (2)

Answered By: 
The Mayor

The new signalling system does not have knowledge of the weight of the train (hence how full it is), therefore the weight of the train is not taken into account when the signalling system calculates what acceleration or deceleration to apply to a train.

The weight of an Underground train does not change the calculation for desired braking and acceleration.

In a process separate from the new signalling system itself, the 1995 stock's braking system does have knowledge of the weight of the train and applies differing levels of braking force. This is also the approach adopted by the new sub-surface stock.