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karatecatman
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Nimish
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Joined: 16 Dec 2006
Posts: 9757
Location: Bangalore, India
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 Posted: Thu May 17, 2007 5:34 pm Post subject: |
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Something fishy about the story IMO (or I've not understood it properly)...
1. Train stops at a place where the overhead line is not electrified
2. Driver unable to start engine and then wants to push the engine to electrified line (5-10 meters away)
3. He decouples engine from train and then gets folks to push the engine to the electrified line (say the engine was pushed out by 5 m)
4. Now what happens? The engine can run, but it needs to come back and couple with the train. The moment it comes back to couple with the train, it's again in unelectrified territory and back to step 1 aboe... So if that's the case, what's the reason to push the engine in the first place ???? |
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BigTom
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Joined: 21 Mar 2007
Posts: 271
Location: Dubai, UAE
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| Posted: Thu May 17, 2007 8:56 pm Post subject: |
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Another thing a bit strange is that neutral zones exist only when there is a switch between DC and AC traction. As far as I know all UP and Bihar have AC traction where electrified, so where then is the need for a neutral zone? Maybe some of our railfan members can throw some light on this? Aseem?
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Akshay
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Joined: 19 Dec 2006
Posts: 315
Location: Mumbai
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| Posted: Fri May 18, 2007 6:08 am Post subject: |
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Neutral zones exist in AC territory also every 25-30 kms. The reason is to separate the various phases of supply. AC electricity is produced 3 phase but the use is of single phase. Hence railways need to separate different phases for which they use neutral zones.
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BigTom
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Location: Dubai, UAE
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| Posted: Fri May 18, 2007 1:29 pm Post subject: |
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Akshay, thanks for that.
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VABBy
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Joined: 19 Dec 2006
Posts: 823
Location: DEL
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| Posted: Sun May 20, 2007 2:18 pm Post subject: |
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This happened near Patna. First of all its was a MEMU (Main Line Electric Multiple Unit) Normally are wider than the typical emu,s which you see running in the city suburbs. The motorman had just disconnected the power car from the trailer cars and asked the passengers to push it till the pantograph which takes the current from the OHE ( Cantanary) was back in the normal AC zone.
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Nimish
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Joined: 16 Dec 2006
Posts: 9757
Location: Bangalore, India
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| Posted: Mon May 21, 2007 2:02 pm Post subject: |
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| VABBy wrote: | | This happened near Patna. First of all its was a MEMU (Main Line Electric Multiple Unit) Normally are wider than the typical emu,s which you see running in the city suburbs. The motorman had just disconnected the power car from the trailer cars and asked the passengers to push it till the pantograph which takes the current from the OHE ( Cantanary) was back in the normal AC zone. |
So the mystery is the same - once the power car got power, how did it help the rest of the train to move? Since it would have to come back to teh original point to couple with the rest of the train - and that point had no power. |
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