Vegetable oil may be knocking around in your cupboards to help you cook your favourite meal. 

But it's not just in the kitchen where it is proving to be a useful commodity. 

Vegetable oil powered trains have now been launched on a rail operator’s network in a first for the industry.

Rather than conventional diesel, Chiltern Railways’ Class 68 locomotive-hauled trains will from today (July 27) be powered Hydrotreated Vegetable Oil (HVO), which is derived from used cooking oils, tallows and other recyclable waste.

The operator claims the innovative fuel will reduce the impact its trains have on the environment and air quality.

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Managing director Richard Allan said: “We are determined to operate a railway that is easier, greener, and better for our customers.

“The conversion of a key part of our fleet of trains to HVO fuel will make a big difference in terms of emissions.”

Oxford Mail: The class 68 locomotive-hauled trains will now be powered by Hydrotreated Vegetable Oil

It is the first instance of HVO fuel being used in passenger service in the UK.

Although more expensive to buy than conventional diesel, Chiltern Railways has decided to make the switch in a bid to modernise and decarbonise its operations through the Right Route 2030 vision.

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The fuel, which contains few impurities and burns cleanly, can reduce greenhouse gas emissions by up to 90 per cent and air particulates by 85 per cent.

It can also reduce other emissions such as NOx and Carbon Monoxide, depending on engine type and usage.  

Rail minister Huw Merriman said: “A reduction in greenhouse gas emissions by up to 90 per cent is an incredible achievement that gets us one step closer to realising these and I commend Chiltern on pioneering this fuel.”

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William Tebbit, chairman of Green Biofuels, said: "Our HVO allows diesel train fleets across the railway network to enjoy a greener drop-in alternative instead of diesel. 

"This is crucial when you think of the air quality issues when trains are in stations and built-up areas. GBF is already supplying HVO to the rail freight sector and is delighted to now be supplying passenger trains. 

"Passengers, train and station staff can now enjoy much better air quality.”  

All HVO fuel used by Chiltern Railways has been previously used and recycled to power part of its fleet.

The Class 68 locomotives being fuelled with HVO haul six Mark III coaches when they are in passenger service, providing seating for more than 300 customers in a spacious interior. 

Chiltern Railways has recently been affected by industrial action which has had an impact on services between Oxford and London.