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A rail union has said it has prepared its members for strikes after "potentially lethal" legionella bacteria was found on Thameslink trains.
The Rail, Maritime and Transport (RMT) union claims that seven toilets on four trains had "actionable traces" of the bacteria, which can cause legionnaires’ disease, PA reports.
Thameslink said the toilets had been drained and bleached but the RMT said this was a “half-hearted and inadequate” approach.
It has also called for an urgent meeting of the company’s Joint Safety Committee.
RMT general secretary Mick Lynch said: “RMT has been raising concerns for weeks now, and the latest cavalier approach from the company is pitifully inadequate and is an outright gamble with passenger and staff health.
“We have now declared a dispute and, be in no doubt, if we don’t get serious action we will ballot our members and do whatever is required to end this reckless approach to a potentially lethal situation on these increasingly busy trains.”
Rob Mullen, train services director at Thameslink, said: “A very low level of Legionella was found to be present during testing in a small number of our Thameslink Class 700 train toilets.
“There is no recorded case of anyone, ever, having contracted Legionella from a train...”
“While it is extremely unlikely this would cause any harm to passengers or colleagues, the toilets affected were immediately locked out of use.
“The trains were taken out of service and these toilets have now been drained, bleached and had their tanks completely re-filled.
“There is no recorded case of anyone, ever, having contracted Legionella from a train.”
The company added: “Legionella can potentially be spread through atomised water droplets in the air in enclosed spaces, but water in our toilets is gravity-fed, which makes this extremely unlikely and further lowers the already very low risk. However, as a precaution, we immediately closed the affected toilets and took these trains out of service.
“The toilets affected have been completely drained, bleached and re-filled to rectify this situation. All other parts of the trains were unaffected, including our air con systems, which do not use water (they use refrigeration to cool the air). Therefore, as Legionella spreads via water-based vapour, it is not possible for it to be present in our air con systems.”
