[6][7][8] The scheme has been put forward in response to the Department for Transport's invitation for proposals from private investors for a southern rail link to Heathrow.

The company states that its proposals would improve public transport capacity and help to reduce traffic congestion and pollution.

[13][14] The proposed route starts in a short section of tunnel from the west end of Terminal 5 station, then rises briefly to the surface to make a connection with the Windsor-Staines Line, with the main route continuing in tunnel following the M25 corridor to connect to existing railway near Chertsey or Virginia Water.

Heathrow Southern Railway claims that the scheme in operation does not need financial support from the tax payer.

While being owned by Heathrow Southern Railway the infrastructure is subject to regulation by the Office of Rail and Road (ORR), and the operation and maintenance of the route could be contracted out to other corporations.