On 11.09.2016 20:48, Russell Coker via luv-main wrote:
On Saturday, 10 September 2016 11:39:09 PM AEST Rick Moen via luv-main
wrote:
I'm reminded about the old British Rail gag about 'the wrong type of
snow'
being cited as an excuse for problems.
https://en.wikipedia.org/wiki/The_wrong_type_of_snow
https://en.wikipedia.org/wiki/Slippery_rail#Other_causes
In Australia we have the wrong type of millipedes! LOL.
The grade trains can climb is governed by the coeffecient of static
friction of steel on steel
which is aprox 0.33, ie a trains tractive effort is aprox 1/3rd of the
vehicles weight. The
maximum grade normally encountered on adhesive railways is around 1 in
16. The load pulled on this sort of grade would be around 3 times the
engines weight.
The maximum grade currently on Victorian lines is 1 in 30 encountered
between Upper Ferntree gully and Upwey, also on the Puffing Billy line
from Cockatoo.
While some of the Melbourne trains can do regenerative braking, I have
been told the rectifer stations cannot handle this so it is not used in
Melbourne. The problem apparently is not enough funds availible for
power supply upgrade, inspite of there being projected excellent savings
can be acheived.
Lindsay
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