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Bristol train lines could see new eco-friendly hydrogen trains introduced as the future of planned electrification remains uncertain.

The new regional trains are being tipped as an alternative to diesel powered trains and transport secretary Chris Grayling says he would like to see the technology introduced “within a short period of time.”

An ongoing public consultation on the future of the Great Western rail franchise, which covers Bristol, south west England, South Wales and the Cotwolds and Malverns, says hydrogen trains could be a solution to a shortage of carriages on the network.

(Image: Alstom)

The consultation document says: “There is a limited supply of rolling stock across the GB rail network and, although over 6,000 new carriages are being introduced to the network by 2024, trains to operate on non-electrified routes are likely to remain in short supply as many existing diesel trains approach life-expiry.

“Addressing rising passenger demand on non-electrified routes is therefore likely to require additional trains, either through new-build or by applying innovative “bi-mode” technologies to existing trains.

"Hydrogen-powered trains will shortly start operation in regular service in Germany, and could also potentially be a solution.”

Hydrogen train technology is being spearheaded by French company Alstom, which is testing the low-emission transports in Germany. If introduced in the South West, the trains would be the first of their kind in the UK.

The trains, called the Coradia iLint, are powered by a hydrogen fuel cell and are “zero emission and silent” according to Alstom.

Managing director of Alstom Uk and Ireland, Nick Crossfield, said: “We strongly support the government’s decision to consult on bringing hydrogen trains to the Great Western route. Hydrogen is the most sustainable and efficient way of eliminating pollution on non-electrified rail lines and Alstom’s hydrogen technology is already being proven in Germany.

“We are ready to bring this exciting technology to the UK.”

The Department for Transport announced in November 2016 the electrification project between Bristol and Bath, as well as between Bristol Temple Meads and Parkway stations, would be paused due to the ballooning £2.8billion costs of the upgrade programme across the Great Western main line.

The decision means the new dual-fueled Hitachi trains will run on diesel between Temple Meads and Bath, before switching to electric power for their onward journey to the capital. While the journey times are estimated to be similar, the mode of transport is less environmentally friendly.

Speaking in parliament on Thursday, January 18, Mr Grayling said: “I expect to see a transformation of technology on our railways over the coming years, with the introduction of different types of battery electric hybrid trains and hydrogen trains, and I see that as a priority. I want the first hydrogen train to operate on our rail network within a short period of time.”