The report into the Tube derailment at White City has blamed Metronet, the private company responsible for the track, and London Underground Limited (LU) for not doing enough to prevent it.

The RMT union immediately called for Metronet to be sacked as a Tube maintenance company for its failure to comply with safety instructions.

Investigators found Metronet had not put in place measures required by the chief Tube engineer after the Camden Town derailment, in which seven people were injured.

No one was injured in the White City incident, where the track layout - in particular a set of points identified as being at risk of "promoting derailment" - closely resembled that at Camden Town.

Safety considerations meant senior engineers had to be consulted before a "switch rail" was changed at the site. Today's report found that Metronet did not follow the new procedure.

The conditions "had not been adequately communicated or explained to individuals within the Metronet Central line track team", investigators concluded.

Their report also criticised LU for failing to properly enforce the requirements.

"Shortcomings also exist in the manner in which surveillance activities are prioritised within London Underground and Metronet to seek assurance that safety critical issues are being managed effectively."

A total of 41 other sites have been identified across the Tube network as resembling the Camden Town site sufficiently to merit the increased safety protocols.

A spokesperson for LU told Local London today a "much greater interest" was being taken in Metronet's maintenance activities at the sites, and that inspectors had "beefed up the assurance regime".

"The recommendations in the report will be implemented to make sure this doesn't happen again," he said.

But the RMT felt such assurances did not go far enough, and demanded maintenance be brought back "in-house", a return to pre-privatisation of the Tube.

General secretary Bob Crow said the report confirmed his union's contention that public-private partnership (PPP) would lead to "dangerous fragmentation and communications breakdown".

"Tube workers and the travelling public expect their safety to be taken seriously. The private firms involved in the PPP are in it primarily to make money, and that is the one thing they have proved themselves to be good at.

"A company that fails to comply with explicit safety instructions put in place after one derailment and as a result causes another should not be allowed to continue operating on the network," he said.

Metronet's infrastructure director defended the company's maintenance team and safety regime. "The team undertaking work at White City was experienced, with a long history of serving the Underground and London Underground was kept appraised as the work progressed", Mr Lloyd Rodgers said.

The company promised, however, to supports the report's recommendations.

LU said it would work very closely with Metronet Rail BCV, and the other infrastructure companies, "to ensure we learn the lessons from this incident and implement the recommendations in the report".