Concrete_Bob
Member
I'm working on some route features based on a local line. How do I convert local gradient terminology [i.e. 1:50} into the scale used in surveyor?
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1:200 0.5%, 1:100 1%, 1:50 2% and so on
Thanks. Presuming then that the height value on the track [advanced] tab is the percentages? A 1:33 Grade would be 3.0 on the surveyor tool? [Otira Tunnel, NZ]
No electrics on the midland line, DX diesels , with an extra 4 bankers on the tunnel gradient.That is exactly what grade is in the Otira Tunnel and it's 8.5 kilometers long. So if you are doing a prototypical route of the west Coast that is what you should be using. Steam locos are not allowed in the tunnel unless they are under light steam i.e. being towed by electric locos.
Cheers,
Bill69
No electrics on the midland line, DX diesels , with an extra 4 bankers on the tunnel gradient.
It was a 10 km section of electrification on a 212 km line, put in place specifically to resolve the issue of excessive smoke from steam locomotives in the tunnel. The last electric locos were purchased in 1968. By 1988, increased volumes of coal freight and larger consists meant that there were not enough units in service at any time to haul a full coal train up the incline. Switching to diesel bankers meant that the two locos used on the eastern side of the tunnel could remain coupled and continue the western side, and vice versa.