The response to the derailments show that the PPP structures probably function as designed with respect to safety

22  The Chancery Lane derailment happened during shadow running, although there were still lessons for the PPPs. LUL and the Infracos agreed 24 technical, engineering and other recommendations - including the need for better communications - to act on in case of similar incidents in the future. The joint responses, investigations and implementation of the resulting improvement recommendations to the latter two derailments suggest that the PPP structures probably function as designed with respect to safety. This tentative conclusion, however, needs to be reviewed in the light of the outcome of the resolution of the related commercial issues.