It would be useful if Ondus had quoted the populations of the above-mentioned cities.
Seoul, Moscow, Tokyo, London, New York, [Mexico] and Paris are all 10m plus.
Nairobi is only 3m according to Wiki.
Sydney is about 5m and has only a small amount of underground rail.
Auckland has a population of under 2m but is planning an underground railway so the Idea of one for Nairobi should perhaps not be dismissed.
It would depend on whether the new line in Auckland is totally or partially underground.
In Nairobi, a lot of railway land is probably squatted on, so undergrounding, even on a cut-and-cover basis would reduce disruption to those squatters.
|16 January 2014 Mombasa|
“Our existing railway is a metre gauge. The physical distance between the inside of one rail to the inside of the other on the railway track is exactly one metre. This gauge is also used in Argentina, Brazil, Chile, Tunisia, Vietnam and Thailand, among others,” he stated.
“It is the gauge used in the railway network of the EAC countries except the Tazara line connecting Tanzania with Zambia, which is 1,067mm (Cape gauge). The majority of the railways in southern Africa, Japan, Indonesia and Australia use this Cape gauge.”
He explained that a main justification for choosing the standard gauge is to ensure railways are of the same gauge for better connectivity between neighbouring countries.
Photo by Shem Oirere
Between Mombasa and Nairobi, the single-track railway will feature 427.3 km of subgrade, 98 bridges, 969 culverts and 77 overpass structures. The majority of the rail system will feature a maximum gradient of 12%, with an allowance of up to 15% in certain sections. Further, the contractor will erect a 1.8-meter-high reinforced-concrete fence along the length of the corridor, CRBC says.
An additional concern is that the new standard gauge railway line will be difficult to integrate with the existing network in East Africa which is mostly narrow gauge, while there have also been questions raised over compensation for those displaced by the construction of the lines.
Most of the objections in Kenya to the new railway are due to possible corruption, and has nothing to do with gauge.
Several countries have long experience with mainline Dual Gauge, and SG-MG is quite suitable for DG:
* Australia in WA and QLD SG-NG
* Brazil BG-MG
* Spain BG-SG
It helps if points and signals are power operated.
Commonwealth (Australia) also piggybacked trainloads of NG rolling stock on rails on SG flatcars, in the mid 1950s.
Bogie exchange is another technique used between SG and BG (not so sure about SG and NG)
There are several other methods.
There phrase "difficult to integrate" is terse and shallow and suggest no deep understanding of potential solutions.
Train crashes into bus at Nairobi rail crossing
At least 11 people killed and more injured in accident in Kenyan capital
A railway line in Kibera slum in Nairobi. Streets and highways often lack basic safety features and most railroad crossings do not have gates or flashing lights. Photograph: David Levene for the Guardian
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