Shares in the Metronet and Tube Lines consortiums fell on Monday after the weekend's derailments on the London Underground.
Two trains came off the tracks that the private consortiums were being paid to maintain under PPP deals signed earlier this year.

Last Friday evening a train was derailed on the Piccadilly Line between Hammersmith and Baron's Court. The section of track involved was maintained by Metronet. The accident is believed to have been caused by a broken rail.

On Sunday morning, 14 passengers were injured when a train was derailed on the Northern Line at Camden Town station. Tube Lines said no problems had been found during an inspection of the track the previous evening.

Shares in Jarvis, a member of the Tube Lines consortium, ended 11p down at 290p on Monday.

The prices of Metronet members Atkins and Balfour Beatty fell 10p to 467.5p and 4p to 215p respectively. Atkins slipped a further 8.5p the following day, and Balfour Beatty closed at 213p.