Wimbledon and Sutton Railway

The Wimbledon and Sutton Railway (W&SR) was a railway company established by an Act of Parliament in 1910 to build a railway line in Surrey (now south-west London) from Wimbledon to Sutton via Merton and Morden in the United Kingdom. The railway was promoted by local landowners hoping to increase the value of their land through its development for housing. It was initially planned that services on the railway would be operated by the London Underground's Metropolitan District Railway (MDR) by an extension of its existing service from Wimbledon.

More information on the Wikipedia page