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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#21
April 21st 08, 05:52 PM
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Central line to be converted to AC?
On 21 Apr, 17:36, Joe Patrick
wrote: It sounds like an April Fools joke but apparently TfL are considering it. http://tinyurl.com/5augle Presumably if this were to go ahead the line would have to be closed for an extended period. "Range: between 90 000 000 and 130 000 000 GBP." 'Ow much?!?!?! That's GBP1-1.5m per train, or GBP150-200k per carriage. Doesn't sounds a million miles out... -- John Band john at johnband dot org www.johnband.org |
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#22
April 21st 08, 06:10 PM
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Central line to be converted to AC?
In message
, at 09:52:48 on Mon, 21 Apr 2008, John B remarked: "Range: between 90 000 000 and 130 000 000 GBP." 'Ow much?!?!?! That's GBP1-1.5m per train, or GBP150-200k per carriage. Doesn't sounds a million miles out... For a couple of electric motors!!!! -- Roland Perry |
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#23
April 21st 08, 06:11 PM
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Central line to be converted to AC?
On 21 Apr, 13:55, Andy wrote:
(per car). Having every axle motored generally allows better acceleration, if all other things are equal. It will be interesting to see how the Northern stock performs, once the trains are used to their full potential. Why arn't they using it already, what are they waiting for? The A stock was doing 60 mph back in the 1960s with no ATO in sight. B2003 |
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#24
April 21st 08, 06:17 PM
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Central line to be converted to AC?
On 21 Apr, 18:10, Roland Perry wrote:
That's GBP1-1.5m per train, or GBP150-200k per carriage. Doesn't sounds a million miles out... For a couple of electric motors!!!! About 10% of the cost of a new carriage to replace the whole drive system? Sounds pretty reasonable to me... -- John Band john at johnband dot org www.johnband.org |
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#25
April 21st 08, 06:30 PM
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Central line to be converted to AC?
In message
, at 10:17:34 on Mon, 21 Apr 2008, John B remarked: That's GBP1-1.5m per train, or GBP150-200k per carriage. Doesn't sounds a million miles out... For a couple of electric motors!!!! About 10% of the cost of a new carriage to replace the whole drive system? Sounds pretty reasonable to me... Why "the whole drive system" ? I still think GBP50K for an electric motor is a bit steep. -- Roland Perry |
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#26
April 21st 08, 06:58 PM
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Central line to be converted to AC?
On 21 Apr, 18:30, Roland Perry wrote:
In message , at 10:17:34 on Mon, 21 Apr 2008, John B remarked: That's GBP1-1.5m per train, or GBP150-200k per carriage. Doesn't sounds a million miles out... For a couple of electric motors!!!! About 10% of the cost of a new carriage to replace the whole drive system? Sounds pretty reasonable to me... Why "the whole drive system" ? I still think GBP50K for an electric motor is a bit steep. You can't run AC motors using electronics designed for a DC system. Though why they feel the need to change the traction package on perfectly servicable still fairly new trains is another matter. I can't imagine them saving 100M in electricity bills before thr trains are life expired. B2003 |
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#27
April 21st 08, 07:37 PM
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Central line to be converted to AC?
On 21 Apr, 18:58, Boltar wrote:
You can't run AC motors using electronics designed for a DC system. Though why they feel the need to change the traction package on perfectly servicable still fairly new trains is another matter. I can't imagine them saving 100M in electricity bills before thr trains are life expired. Basically, because the DC motors weren't very reliable in the first place and are now apparently completely f***ed - the choice isn't "leave them or replace with AC", it's "persuade someone to build new obsolete-but-not-knackered DC motors or replace with AC". -- John Band john at johnband dot org www.johnband.org |
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#28
April 21st 08, 10:44 PM
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Central line to be converted to AC?
On 21 Apr, 19:37, John B wrote:
Basically, because the DC motors weren't very reliable in the first place and are now apparently completely f***ed - the choice isn't "leave them or replace with AC", it's "persuade someone to build new obsolete-but-not-knackered DC motors or replace with AC". If they're knackered already I wonder if they can get compensation from the manufacturers (assuming they're still around) since I'm pretty sure the design lifetime must have been lot more than 12 or so years. B2003 |
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#29
April 21st 08, 11:42 PM
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Central line to be converted to AC?
On Apr 21, 10:44 pm, Boltar wrote:
Basically, because the DC motors weren't very reliable in the first place and are now apparently completely f***ed - the choice isn't "leave them or replace with AC", it's "persuade someone to build new obsolete-but-not-knackered DC motors or replace with AC". If they're knackered already I wonder if they can get compensation from the manufacturers (assuming they're still around) since I'm pretty sure the design lifetime must have been lot more than 12 or so years. The trains were built by ABB/Adtranz (now Bombardier), but the traction system was built by Brush. I've no idea how the legal liability trail would work, or whether a court would hold that a 15- year lifespan for the motors was unreasonable... -- John Band john at johnband dot org www.johnband.org |
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#30
April 22nd 08, 12:43 AM
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Central line to be converted to AC?
On 21 Apr, 23:42, John B wrote: On Apr 21, 10:44 pm, Boltar wrote: Basically, because the DC motors weren't very reliable in the first place and are now apparently completely f***ed - the choice isn't "leave them or replace with AC", it's "persuade someone to build new obsolete-but-not-knackered DC motors or replace with AC". If they're knackered already I wonder if they can get compensation from the manufacturers (assuming they're still around) since I'm pretty sure the design lifetime must have been lot more than 12 or so years. The trains were built by ABB/Adtranz (now Bombardier), but the traction system was built by Brush. I've no idea how the legal liability trail would work, or whether a court would hold that a 15- year lifespan for the motors was unreasonable... Perhaps LU compromised somewhat on the motors? |
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