NSW three board speed signs

 
  millerhouse Beginner

Recently I observed a cleanup work on the Brisbane - Sydney mainline north of Kyogle e.g. removal of the redundant telegraph poles. I also notice the as yet commissioned new three level speed boards.

I was wondering what the EP stands for on the middle yellow board?

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  KRviator Moderator

Location: Up the front
EP= "Enhanced Performance Freighter"
  br30453 Chief Train Controller

EP= "Enhanced Performance Freighter"
KRviator

Which leads to the next question.


What is an "Enhanced Performance Freighter"?
  theanimal Chief Commissioner

designed to work on cant deficiency corners
  Newcastle Express Chief Commissioner

designed to work on cant deficiency corners
theanimal
And is that just a way of saying reducing train speed limits, without actually saying reduced train speed limits?
  KRviator Moderator

Location: Up the front
Not necessarily. The notice for these new speed boards implies they're actually reducing the length of the lower limit by moving the low boards closer to the relevant curve. Don't read too much into it.
  Piston Train Controller

Which leads to the next question.


What is an "Enhanced Performance Freighter"?
br30453
So how does the driver know if his train is an "Enhanced Performance Freighter" or an "Unenhanced Performance freighter?" There must be a definition written somewhere.Shocked
  sashmo Chief Commissioner

Location: Brisbane Qld
for those wondering what the new boards look like.

http://www.flickr.com/photos/sashmos_pics/9712794143/in/set-72157627850004423

taken near Kempsey on the NSW North Coast. and for the record the old boards just out of view had 80/85 on them.

Sashmo
  cootanee Chief Commissioner

Location: North of the border!
"This SAFE Notice details the upgrade of curve speeds on the ARTC network from Maitland to Acacia Ridge. ..."

http://extranet.artc.com.au/docman/DocManFiles/DocTypes/SAFE/Files/2-1964.PDF?106908628
  MD Chief Commissioner

Location: Canbera
Does anyone know the engineering basis of how the speeds are determined?
Is there a formula that relates curve radius, speed , axle load and cant angle?
  br30453 Chief Train Controller

Does anyone know the engineering basis of how the speeds are determined?
Is there a formula that relates curve radius, speed , axle load and cant angle?
MD
This document gives the engineering basis.


[color=#0000ff][size=3][font=Times New Roman]http://extranet.artc.com.au/docs/eng/track-civil/procedures/track-geo/Section5.pdf[/font][/size][/color]


Enhanced performance applies to certain types of rollingstock and the train has to be composed completely of these.


Introduction of 110mm cant deficiency for curves between 235m radius and 501m radius for freighters on the interstate lines.


110mm is the cant deficiency allowed when determining speeds for XPTs so it looks as if EP freighters will have same speeds around these curves as the XPTs.





  KRviator Moderator

Location: Up the front
I dug up a little more info on these now-not-so-new speed boards...ARTC has published a Route Condition Notice with some more details about them for a little bed time reading.

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