Nottingham has a number of significant hills, which pose a difficult problem for transport and infrastructure such as water distribution networks and transportation of sewage.
trains have a number of key restraints, maximum gradient (1/200 for freight and 1/60 for HS2), minimum track radius and maximum track angle on bends.
three railway companies decided on a system of 5 tunnels to overcome the terrain, and avoid trying to get trains over the ridge line
Mapperley Tunnel is just over 1km at 1,044m, built for the Derbyshire and Staffordshire Extension of the Great Northern Railway.
The tunnel was in use by 1875 but suffered a roof collapse due to mining subsidence on 23 January 1925. A length of roof about 12 yards long collapsed, blocking the line with approximately 150 tons of rubble. the tunnel was closed on 4 April 1960. The eastern portal is still open and accessible, and the tunnel itself is open to a point just west of the second air shaft. Beyond the second air shaft the tunnel has been filled with earth. A large quantity of rubbish has been thrown down the second air shaft, which is highly unstable and may collapse in the future, causing injury to anyone present
great explore, very muddy, lots of water dripping from ceiling, likely made worse by few days of recent rain.
walked into the tunnel under the first air shaft and heard what sounded distinctly like footsteps coming in my direction which was fun, turns out it was just water falling on some of the rubbish at the end of the tunnel
rubbish pile is very unstable, especially combined with all the water flowing through it, entrance to tunnel is also unstable with sections of brick caved in, and parts of the arch detaching and sinking down. would probably be in ones best interests not to interfere too heavy handily with the rubbish pile or pull bricks out of the wall at tunnel entrance.
few helical gears
note collapsed section of arch just left of keystone
iphone 6s
air vent
very interesting limestone build up
water drain running down center
limestone build up in rest area
trains have a number of key restraints, maximum gradient (1/200 for freight and 1/60 for HS2), minimum track radius and maximum track angle on bends.
three railway companies decided on a system of 5 tunnels to overcome the terrain, and avoid trying to get trains over the ridge line
Mapperley Tunnel is just over 1km at 1,044m, built for the Derbyshire and Staffordshire Extension of the Great Northern Railway.
The tunnel was in use by 1875 but suffered a roof collapse due to mining subsidence on 23 January 1925. A length of roof about 12 yards long collapsed, blocking the line with approximately 150 tons of rubble. the tunnel was closed on 4 April 1960. The eastern portal is still open and accessible, and the tunnel itself is open to a point just west of the second air shaft. Beyond the second air shaft the tunnel has been filled with earth. A large quantity of rubbish has been thrown down the second air shaft, which is highly unstable and may collapse in the future, causing injury to anyone present
great explore, very muddy, lots of water dripping from ceiling, likely made worse by few days of recent rain.
walked into the tunnel under the first air shaft and heard what sounded distinctly like footsteps coming in my direction which was fun, turns out it was just water falling on some of the rubbish at the end of the tunnel
rubbish pile is very unstable, especially combined with all the water flowing through it, entrance to tunnel is also unstable with sections of brick caved in, and parts of the arch detaching and sinking down. would probably be in ones best interests not to interfere too heavy handily with the rubbish pile or pull bricks out of the wall at tunnel entrance.
few helical gears
note collapsed section of arch just left of keystone
iphone 6s
air vent
very interesting limestone build up
water drain running down center
limestone build up in rest area
