Transport for London and RMT clash over tunnel incident RM, which is embroiled in a pensions dispute with Transport for London, said the incident in which a Bakerloo Line train clipped part of the tunnel wall, exposed London Underground's "cavalier attitude" to safety. The situation was complicated by a strike by RMT staff working for Tube Lines, a wholly owned TFL subsidiary and operator of three other lines on the network - the Jubilee, Northern and Piccadilly. While the stoppage has had no impact on these lines, services on the Bakerloo - where RMT members have been working normally - were disrupted throughout the day. Bob Crow, RMT's general secretary, said: "This emergency incident exposes Transport for London's cavalier attitude to the work of its emergency response unit and exposes once again their willingness to chance their arm on public safety." While TfL believes that RMT has sought to capitalise on the incident to mask how the walkout failed to disrupt services, the union has accused TfL of trying to cover up a more serious incident. Nigel Holness, London Underground's operations director, said: "There is no tunnel collapse in the Bakerloo line, nor is there any flooding or any injuries.