From September, the train will carry passengers regularly on its lines.
The company uses a series 168 diesel train built by Bombardier Transportation, equipped with a Rolls-Royce hybrid power system.
The hybrid engine runs with a 25 % reduction in CO2 emissions, a reduction of 70 % in nitrogen oxide emissions and also slashed particulate emissions by some 90 %.
At stations it runs on battery storage – resulting in zero emissions and near-silent operation.
The technology will significantly improve air quality and reduce noise at major stations and in urban districts.
And the speed of operation will also improve, thanks to the combination of diesel fuel and electricity.
Chiltern Railways runs a fleet of diesel trains with an average age of 25 years. Its trains operate between London and Birmingham and on other routes.
Great Britain has officially committed itself to achieving zero carbon emissions by 2050 and the use of new new technologies on existing trains should help facilitate this task in financial terms, according to analysts.