From the BBC website back in March:

Mr Johnson, who is standing for re-election in May, said if returned to office he would not buy new Tube trains with drivers’ cabs.

From the pages of Modern Railways, November 2012 issue:

Since the existing 95/96 design Tube stock on the Northern and Jubilee quite definitely has drivers’ cabs, is this the next in a long line of Boris election promises that he has no intention of keeping?

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