The report, compiled by the Rail Accident Investigation Branch (RAIB)
following a derailment close to Phipps Bridge on May 26 last year,
found Croydon Tramtrack had a poor relationship with First Tram
Operations Ltd which manages its drivers and controllers.

'Found' would imply that it was one of the results of the investigation but
I've read the report and it is more of an aside.

According to the report, the poor relationship had the potential to
affect safety on the network.

But Tramtrack said it did not understand how the accident investigator
had come to this conclusion.

I am tending to their point of view on this one. The only examples cited in
the report for the supposed poor relationship were the purchase of a track
maintenance vehicle and modifications to control room software which were
apparently carried out by TCL, who own the system and provide the
infrastructure, without consultation with TOL, who are their sub-contractors
to operate it. It seems a major leap from there to concluding there are
potential safety problems.

Maybe there are issues but I can't see how the report could be used as a
weapon by TfL.