Rail companies are facing a £5m lawsuit after a train derailment caused a large fuel spill, according to a report by BBC Business. More than 400,000 litres reportedly escaped in the area, and the incident has been characterised as an environmental disaster.

The source headline refers to an oil spill, while the accompanying summary describes the substance as fuel. The available evidence does not specify the exact petroleum product involved or explain how the reported volume was measured.

No details have been supplied about the location of the derailment, when it happened or how many rail companies are being sued. The identities of the companies and the party bringing the claim are also not included in the available report summary.

It is not yet clear what losses or costs make up the £5m claim. The evidence does not state whether the amount relates to environmental damage, recovery work, business losses, property damage or another form of compensation.

The information provided also does not establish what caused the train to derail or set out the legal arguments against the rail companies. No response from the companies, court timetable or indication of whether liability is disputed has been supplied.

What is clear from the reported figures is the scale of the release and the financial value attached to the legal action. Further reporting or court documents would be needed to establish the full environmental impact, the basis of the claim and who may ultimately be held responsible.