Question to the Department for Transport:

To ask the Secretary of State for Transport, what the timeline is for ending the practice of dumping human waste and effluent on tracks, by (a) route and (b) franchise.

The timeline for ending the practice of toilets discharging to the tracks will be driven by the introduction of new rolling stock and the major refurbishment of existing rolling stock.

By the end of this year it is estimated that a small number of vehicles will still discharge to the track.