Running between Russell Square and West Croydon bus station, it is operated by London Central, a subsidiary of Go-Ahead London.

Route X68 commenced on 27 October 1986 as a peak-hour, express version of route 68 operating between Russell Square and West Croydon bus station with no stops made between West Norwood and Waterloo.

It was operated by London Regional Transport's Norwood bus garage with Leyland Olympians fitted with high back seats.

Upon being re-tendered it passed to London Central on 3 April 2006 being operated by Wright Eclipse Gemini bodied Volvo B7TLs.

[2][3] London Central successfully retained the route when re-tendered, commencing new contracts in 2011 and 2018, with Alexander Dennis Enviro400H MMCs introduced with the commencement of the latter contract.