Tubeworker is beginning to wonder just how major an incident has to be before Central Line management will carry out a formal investigation.
Tree falling by the line and damaging trains? Nah. Tunnel roof falling in? Nah. Stabbing causing serious injuries? Nah.
Management seem to think that all these can be dealt with by local reports or 'workshops'. Perhaps that makes it easier for them to gloss over their own failings and blame staff? Without a formal investigation, who knows?