Trog
Established Member
Tunnels are named, bridges are numbered
All the bridges round here have names, and all tunnels are numbered in the same list as the bridges.
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Tunnels
- Thread starter Harlesden
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All the bridges round here have names, and all tunnels are numbered in the same list as the bridges.
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Harlesden
Member
Although Hertford North is further (from Bowes Park) it is actually a cheaper fare than Bayford. So orft we jolly well go to Hertford North tomorrow.
swt_passenger
Veteran Member
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The tunnel or bridge distinction is related purely to the length, not the construction method, I was always told this was because the rules for protection are different.
IIRC there is a set length of about 50 yards (or is it metres?) above which any bridge is named as and treated as a tunnel for rule book purposes.
IIRC there is a set length of about 50 yards (or is it metres?) above which any bridge is named as and treated as a tunnel for rule book purposes.
Trog
Established Member
Structures to be treated as tunnels in relation to the rules are those listed as such in the Sectional Appendix. Regardless of length, name or construction.
The length bit comes in for bridge inspection by the Civil Engineer, structures under 2 chains in length usually bridges (exact length may differ over time and between different railway companies) are inspected as one item. Longer structures are inspected in sections, most structures inspected this way are tunnels, so for inspection if it is over 2 chains long it is a 'tunnel'.
For strict engineering useage if it is dug through something it is a tunnel, if it is built over something it is a bridge, and if you build a structure then bury it you have a covered way.
The length bit comes in for bridge inspection by the Civil Engineer, structures under 2 chains in length usually bridges (exact length may differ over time and between different railway companies) are inspected as one item. Longer structures are inspected in sections, most structures inspected this way are tunnels, so for inspection if it is over 2 chains long it is a 'tunnel'.
For strict engineering useage if it is dug through something it is a tunnel, if it is built over something it is a bridge, and if you build a structure then bury it you have a covered way.
Some decent tunnel journeys.
For a journeys in a proper long tunnel (1 mile plus)through a hill:
What % of the journey from Grindleford to Dore is in a tunnel?
Totley Tunnel is 5,700m (6230 yd) long.
For journeys in proper long tunnels (1 mile plus)through hills and at speed:
What % of the journey from Sheffield to Stockport is in a tunnel?
Totley Tunnel is 5,700m (6230 yd) long.
Cowburn Tunnel 1,776m (1942 yd) long.
Disley Tunnel 3535 (3,866) yd
For a journeys in a proper long tunnel (1 mile plus)through a hill:
What % of the journey from Grindleford to Dore is in a tunnel?
Totley Tunnel is 5,700m (6230 yd) long.
For journeys in proper long tunnels (1 mile plus)through hills and at speed:
What % of the journey from Sheffield to Stockport is in a tunnel?
Totley Tunnel is 5,700m (6230 yd) long.
Cowburn Tunnel 1,776m (1942 yd) long.
Disley Tunnel 3535 (3,866) yd
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