As the UK prepares to retire its diesel train fleet, companies like Hitachi and Siemens are developing battery-powered trains as sustainable alternatives.

These trains, currently undergoing testing, can run on electrified tracks and unelectrified lines using lithium batteries, reducing fuel costs and emissions.

Hitachi's 'tri-mode' trains, which feature battery units in place of diesel generators, have been tested at the company's Newton Aycliffe factory, achieving up to 50% fuel savings.

The company envisions a diesel-free rail network in the future.

Siemens, meanwhile, is developing battery-only trains in Goole, targeting future orders from operators such as ScotRail and GWR.

Battery trains already operate in Japan and Germany, but safety concerns, particularly regarding potential fire risks, are being addressed through extensive testing and technology like heat shields and cooling systems.

The initiative aligns with the UK government's push for net-zero carbon emissions by 2050 and reflects advancements in battery technology and changing political agendas.

However, challenges remain, such as the need for electrification of certain tracks and addressing safety in environments like tunnels.