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<p>Ensuring the welfare of passengers and rail staff remains a top priority for the
Government, particularly during hot weather, which can increase the risk of dehydration,
heat exhaustion or fainting. The Office of Rail and Road is responsible for safety
oversight of the railway in Great Britain and works with train operators to encourage
all passengers to follow the latest public health and travel advice.</p><p> </p><p>While
no study has been undertaken specifically on the health and safety issues of water
not being provided on services lasting more than three hours, the advice to passengers
is to carry a bottle of water on all train journeys in hot weather so that they can
keep hydrated. Most modern trains also have air conditioning installed to maintain
cool temperatures, but where air conditioning is not available, operators ventilate
trains as best as they can by opening windows throughout journeys and train doors
at stations, where possible. Many operators also offer free water in hot weather and
when services are delayed.</p>
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