Bakerloo line extension over the coming years. During 2005–06, TfL commissioned a transport strategic report for London, "Transport 2025: transport challenges for a growing city". Transport commentators have reported that this publication had recommended a Bakerloo extension as the most beneficial option for extending the Tube in South London, and that it considered three route options for the Bakerloo line; from Elephant & Castle, the proposed routes were either south to Camberwell and Streatham, or east to Beckenham and Hayes: Option 1: via Burgess Park, east to and ,with the option of taking over the Hayes Line to terminate at Option 2: south
Bakerloo line at Warwick Avenue station showed "Camberwell" as a destination until the 1990s. One oddity is that, almost from its opening until 1917, the Bakerloo operated with the polarity of the conductor rails reversed, the outside rail negative and the centre rail positive. This came about because the Bakerloo shared a power source with the District Railway. On the Bakerloo, the outside conductor rail tended to leak to the tunnel wall, whereas on the District Railway, the centre rail shared a similar problem. The solution was to reverse the polarity on the Bakerloo line, so that the negative rail leaked on