Cyclists planning to put on their thermal base layers
and go on some winter rides in the Peak District may be advised to check whether the Monsal Trail tunnels are open before setting off.
Pedal Peak District has said the tunnels - which were only re-opened to public access this year - may have to shut in very wintry conditions due to problems like icicles, ice and maintenance problems.
In such cases there will be tunnel closed signs at Hassop, Great Longston and Millers Dale stations, plus Wyedale, while the news will be on the Pedal Peak District website.
It also noted the four tunnels lit in daylight hours for safety reasons use light-sensitive switches and thus are not lit at night - meaning anyone passing through in late afternoon during December and January after the sun sets should take a torch.
The tunnels had been shut off to the public since the Midland Railway line was closed in 1968 as part of the Beeching Cuts.
Work to reopen them for cyclists on the trail began in 2009 and was completed in May this year.