Question to the Department for Transport:

To ask the Secretary of State for Transport, how many trains in service still discharge effluent onto the rail tracks.

There are currently fewer than 500 trains that discharge effluent onto the rail network, this excludes non-Department for Transport services such as those let by Scottish Ministers, Open Access or charter operators. By 31 December 2019, all Department for Transport Franchisees will have ceased the discharge of effluent, this will be achieved by modifications or the introduction of new trains.