From: marc.gr.vandyck@invalid.skynet.be   
      
   Jishnu Mukerji wrote :   
   > On 6/4/2014 5:20 AM, rcp27g@gmail.com wrote:   
   >> On Wednesday, 4 June 2014 04:16:20 UTC+2, Clark F Morris  wrote:   
   >>   
   >>> Because the E units have 6 axles, the individual axle load should be   
   >>> less and it would be interesting to compare centers of gravity.   
   >>   
   >> The E series does not have a particularly light axle load, because although   
   >> it has 6 axles, it is a heavyweight machine.  An E9 has 2400 hp, weighs 140   
   >> tonnes and rides on 6 axles, giving an axle load of 23.3 tonnes.  An HST   
   >> power car (1970s design) has 2250 hp, weighs 70 tonnes and rides on 4 axles,   
   >> giving an axle load of 17.5 tonnes.   
   >>   
   >> The real question is why modern locomotives end up so heavy.  I expect part   
   >> of it is that FRA requirements lead to the need for a much heavier   
   >> structure, and part of it is that the customers don't bother specifying a   
   >> lightweight locmotive, so they get what they ask for.   
   >>   
   >> Robin   
   >>   
   >   
   > But a vanilla Vectron in Europe has an axle load over 22.5 t. So it is   
   > not like it is a pure American phenomenon. No FRA in Europe.   
      
   Vectron = 5.2 MW (7000 HP), tractive effort 300 kN. I don't believe   
   you could transmit thit to the rails with less weight than that.   
   As far as I know, you need roughly two US-built CC diesels to achieve   
   the same power (tractive effort I'll admit I don't know). How much   
   weight would that be ?   
      
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   Marc Van Dyck   
      
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