The train left the tracks at a depot near Ramsgate in a "low-speed derailment" in November.

Southeastern is currently in the process of obtaining 13 new units that will replace older trains.

Southeastern said on Saturday morning there was a "failure of the electricity supply" at Tonbridge.

Southeastern Rail staff rescue a dog that ran into a tunnel causing delays to train services.

The new units will operate on the Metro network linking London to Dartford, Gravesend and Sevenoaks.

The toilets are part of a "multi-million pound investment" and will installed on 30 units.

Southeastern says the reduced track costs announced on 6 January could lead to "more services".

The train operator said the 36 units due for an upgrade entered service in 2004.