Portal:London transport/Anniversaries/12 September
- 12 September
- 1901 – District Railway sells Brompton and Piccadilly Circus Railway to the Metropolitan District Electric Traction Company.
- 1932 – District line extends from Barking to Upminster.
- 1960 – Rickmansworth to Amersham and Chalfont & Latimer to Chesham sections of Metropolitan line electrified.