Red Arrow route 507 commenced operating on 7 September 1968 as part of the Red Arrow  network of flat fare bus routes aimed at commuters in Central London linking some of the capital's main railway termini.

On 2 June 2002, along with route 521, the route was the first bus route in London to be converted to articulated bus with Mercedes-Benz O530G Citaros.

During late 2003, early 2004, a series of onboard fires on Mercedes-Benz O530Gs led to withdrawal of the entire fleet, while Mercedes-Benz made some modifications.
During this period limited services operated using a variety of different buses on route 507, including double-deckers.

On 25 July 2009, as part of the move to replace London's articulated buses, the O530Gs were replaced by Mercedes-Benz O530 Citaros.

Another criticism of articulated buses was the low number of seats, with only 49 per vehicle.
A standard rigid Citaro has 44 seats, however the new ones for route 507 have just 21, with room supposedly for up to 76 standees, leading to criticism the new buses were "cattle trucks" and even more crowded than the buses they replaced.

In December 2013, two trial BYD electric buses were introduced.
In September 2016, Alexander Dennis Enviro 200 bodied BYD electric buses began to operate the route.
 In September 2016, the buses on this route and the 521 have received new digital route displays.
Red Arrow route 507 commenced operating on 7 September 1968 as part of the Red Arrow  network of flat fare bus routes aimed at commuters in Central London linking some of the capital's main railway termini.
On 2 June 2002, along with route 521, the route was the first bus route in London to be converted to articulated bus with Mercedes-Benz O530G Citaros.
During late 2003, early 2004, a series of onboard fires on Mercedes-Benz O530Gs led to withdrawal of the entire fleet, while Mercedes-Benz made some modifications. During this period limited services operated using a variety of different buses on route 507, including double-deckers.
On 25 July 2009, as part of the move to replace London's articulated buses, the O530Gs were replaced by Mercedes-Benz O530 Citaros.
Another criticism of articulated buses was the low number of seats, with only 49 per vehicle. A standard rigid Citaro has 44 seats, however the new ones for route 507 have just 21, with room supposedly for up to 76 standees, leading to criticism the new buses were "cattle trucks" and even more crowded than the buses they replaced.
In December 2013, two trial BYD electric buses were introduced. In September 2016, Alexander Dennis Enviro 200 bodied BYD electric buses began to operate the route.  In September 2016, the buses on this route and the 521 have received new digital route displays.
London Buses route 507