XPT Train accident Wallan

 

Pinned post created by dthead

Posted 4 months ago

  WimbledonW Junior Train Controller

Wallan Loop has not been extended to 1800 metres (It works out to be 1571 metres)
"Nightfire"


I stand corrected. W. 2020-04-25/07:31

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  billjohnston Station Master

Red over yellow with 80 is not permitted in Vic after a dispute between ARTC and the Victorian regulator. This means the passing lane entry is seriously restricted despite the high speed points. I suspect drivers are aware of the points being high speed despite the signal aspect and this may have been a contributor to the incident at Wallan a few years ago when a down pass entered the loop at high speed.

Bill Johnston
  kitchgp Chief Commissioner


…………………………………..................................................

At the time train 8625 was traversing the turnout, the train was travelling at approximately 97 km/h. This was about 80 km/h greater than the signalled speed and about 55 km/h greater than the turnout design speed. As a result, there would have been significant lateral forces on the rolling stock and infrastructure as the train traversed the turnout into the loop road.

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‘Over-speed of V/Line passenger train 8625 over points at Wallan loop Wallan, Victoria on 11 July 2015’ – ATSB Investigation number: RO-2015-011
  KRviator Moderator

Location: Up the front
I suspect drivers are aware of the points being high speed despite the signal aspect and this may have been a contributor to the incident at Wallan a few years ago when a down pass entered the loop at high speed.

Bill Johnston
billjohnston
The single biggest contributor to Wallan I was some twat who couldn't drive a greasy stick up a pigs asre, and was already being performance managed as such. He didn't bother slowing for the points at all, and if the home signal was being held at Stop because both roads were already occupied, there would have been a bigger pileup than Violet Town. Ol' mate didn't even begin braking until he was within sight of the points, notwithstanding the Distant was showing Caution. He should count his blessings the signal was off, even if it was set for the loop. Complacency regarding turnout speed wasn't a factor.
  WimbledonW Junior Train Controller


The searchlight signals at that end (in new positions) were also changed to RYG in separate lamp cases.
"WimbledonW"


What is the correct name for the Non-Searchlight signals?
  historian Deputy Commissioner

When the loop was 900m long, the turnouts installed in 1960 would have been the same, and low speed, with the arrival home showing R/R/Y.
WimbledonW

The use of low speed warning (R/R/Y) on the arrival home on the original standard gauge loops had nothing to do with the turnout geometry - the turnouts were the standard VR medium speed turnout. This is shown by the fact that the departure signal from the loop showed clear medium speed (R/G) good for 25 mph or 40 km/h.

The reason for the use of low speed warning was that the clearance point at the departure end of the loop was only just beyond the departure home signals. The VR really did not want the driver of an approaching train about to cross to misjudge their braking, run past the departure homes, and foul the other train.

It should be noted that arrival home *only* showed stop (R/R), low speed warning (R/R/Y), and clear normal speed (G/R), and that when crossing the driver of an approaching train would get a low speed warning irrespective of whether the train was signalled into the straight or the loop.

Incidentally, the Western line has a similar approach. The loop points are good for 65 km/h, but an arriving train for a cross only gets medium speed warning (R/Y - 40 km/h) and approach released and time operated at that. A train departing from the loop, however, gets medium speed warning with a 65 indicator - good for the full 65 km/h.
  historian Deputy Commissioner


The searchlight signals at that end (in new positions) were also changed to RYG in separate lamp cases.


What is the correct name for the Non-Searchlight signals?
WimbledonW

Colour light signals.
  WimbledonW Junior Train Controller

When the loop was 900m long, the turnouts installed in 1960 would have been the same, and low speed, with the arrival home showing R/R/Y.
WimbledonW


The reason for the use of low speed warning was that the clearance point at the departure end of the loop was only just beyond the departure home signals. The VR really did not want the driver of an approaching train about to cross to misjudge their braking, run past the departure homes, and foul the other train.

In NSW, the arrival Home signal is typically 200m from the departure signal (compared to perhaps 50m in Victoria. So the arriving trains has an overlap of sorts. Also the points at each end are set in opposite directions to that the arriving train has a loop long overlap if that track is clear of a third train.
  skitz Chief Commissioner

When the loop was 900m long, the turnouts installed in 1960 would have been the same, and low speed, with the arrival home showing R/R/Y.


The reason for the use of low speed warning was that the clearance point at the departure end of the loop was only just beyond the departure home signals. The VR really did not want the driver of an approaching train about to cross to misjudge their braking, run past the departure homes, and foul the other train.

In NSW, the arrival Home signal is typically 200m from the departure signal (compared to perhaps 50m in Victoria. So the arriving trains has an overlap of sorts. Also the points at each end are set in opposite directions to that the arriving train has a loop long overlap if that track is clear of a third train.
WimbledonW
Some systems also ban the practice of simultaneous arrivals for the same reason

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