A prototype was produced for testing and accreditation in August 2015, with introduction to service in 2016.Old tube trains gain a new lease of life - The Engineer. Retrieved 2020-12-02. The first Class 230 service to carry passengers operated on 19 July 2017 when a unit was used to operate a shuttle service from Honeybourne to the Rail Live exhibition at the Quinton Rail Technology Centre."D-Train to carry passengers" Rail issue 824 13 April 2017
