What distance does VLocity need to reach 160km/h

 
  tom9876543 Train Controller

Hi,
The Wikipedia page for VLocity states the acceleration is 0.9 m/s2.
Even if it is assumed the train is on perfectly flat/straight track, 0.9 must be a theoretical number that never occurs in the real world.
I was under the impression acceleration changes depending on how fast the vehicle is going.
Would anyone know the distance a VLocity requires to reach 160km/h (assuming perfectly flat/straight track)?
Thanks.

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  Bogong Chief Commissioner

Location: Essendon Aerodrome circa 1980
Well up a 1 in 48 grade, probably never. By contrast if dropped from a helicopter, I suspect they can go from 0 to 160 kmh in about 3 seconds.

What I'm saying is that it depends on a great number of factors like gradient, track condition, adhesion to damp track, passenger loading, curves, et. al. So I doubt that I doubt there is a concrete figure like the one you are looking for.
  L1150 Assistant Commissioner

Location: Pakenham Vic.
Woodford is the man for your answer.

Yarragon and Trafalgar are 8 km apart, on pretty much level and straight track. Stopper V'locitys usually manage to get to 160 in, I estimate, about half the distance and hold that speed for a short while before needing to brake for the next stop.

Incidentally, the last time I traveled on the evening down flagship express which runs non stop from Warragul to Moe, the time from passing Yarragon platform to passing Trafalgar platform was 3 minutes and 4 seconds which gives an average speed of 156Km/h!Very Happy
  woodford Chief Commissioner

Distance taken for a 3 car VLocity to reach 160kph on level track is aprox 2400 metres, time taken is around 80 seconds. Its likely that a longer consist will take a slightly shorter distance as the total aerodynamic drag in relation to total power is lower on these longer vehicles.
This is calculated incrementally using a time interval of 1 sec between increments, the accelaration curve so generated has been check against a live VLocity up to 130kph and the fit was quite good.  

In comparison a N class loco pulling a 6 car train (5 pass cars and a power van) will reach only 100kph in the same distance and take aprox 140 secs to do it.

woodford
  L1150 Assistant Commissioner

Location: Pakenham Vic.
I've often wished that I could have some means of knowing the current speed of a train I'm on, other than by timing Km posts with a stopwatch. (It would be nice if the "next Station"  LED display would also show current speed!) My brother in  law who is into bike racing (Bikes that you pedal, not motor bikes) says that he has a "bike computer" which uses GPS technology to give an indication of instantaneous speed. I wonder if something like that could be used on trains. I've noticed that mobile phone reception  is not all that good on V'locities, so I'm not sure how well the gps signals would be picked up. Has anyone experimented with using a GPS device to find out how fast the train they're on is going?Very Happy
  railblogger Chief Commissioner

Location: At the back of the train, quitely doing exactly what you'd expect.
If you have a smartphone, there are apps that can give you this information.
  richardlu_yy Chief Train Controller

Location: Singapore
I've often wished that I could have some means of knowing the current speed of a train I'm on, other than by timing Km posts with a stopwatch. (It would be nice if the "next Station" LED display would also show current speed!) My brother in law who is into bike racing (Bikes that you pedal, not motor bikes) says that he has a "bike computer" which uses GPS technology to give an indication of instantaneous speed. I wonder if something like that could be used on trains. I've noticed that mobile phone reception is not all that good on V'locities, so I'm not sure how well the gps signals would be picked up. Has anyone experimented with using a GPS device to find out how fast the train they're on is going?Very Happy
L1150

Google My Tracks on Android is a good app for this.
  don_dunstan The Ghost of George Stephenson

Location: Adelaide proud
If you have a smartphone, there are apps that can give you this information.
railblogger

Most smartphones will have a satellite tracking thing on them that can show you how fast you're travelling.

A while ago I switched mine on during a typical V/locity trip to Ballarat and it showed we were clearly doing the much-touted top speed of 160kmh in places along the trip, particularly Deer Park to Melton and most of the straights between the Ingleston bank and Ballarat.
  The Vinelander Minister for Railways

Location: Ballan, Victoria on the Ballarat RFR Line
Most smartphones will have a satellite tracking thing on them that can show you how fast you're travelling.

A while ago I switched mine on during a typical V/locity trip to Ballarat and it showed we were clearly doing the much-touted top speed of 160kmh in places along the trip, particularly Deer Park to Melton and most of the straights between the Ingleston bank and Ballarat.
don_dunstan


I switched from using my trusty analogue watch to work out train speeds to the smart-phone some years ago, however its harder to get a satellite connection in a VLocity than any other train...unsure why..

Mike.
  woodford Chief Commissioner

I switched from using my trusty analogue watch to work out train speeds to the smart-phone some years ago, however its harder to get a satellite connection in a VLocity than any other train...unsure why..

Mike.
The Vinelander


The tinting on the windows in the VLocity's is a thin metal fiilm this sheilds the pass compartment quite well.

The fastest VLocity I have timed did 167kph for 4 consective kilometres. The fastest Sprinter I have timed did 137kph for quite along way and the fastest N class loco was 125kph, this was also for a good distance. Such speeds are very rare though.

woodford
  tom9876543 Train Controller

Thank you woodford for the excellent information.

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