From: nick.fotis@gmail.com   
      
   On 04/06/2014 22:27, Marc Van Dyck wrote:   
   > 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.   
      
   Ask for the experience with the Greek "Hellasprinter" version of   
   Eurosprinter locomotives.   
   Five MW on 80 metric tonnes.   
      
   > 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 ?   
      
   Note that straight electric locomotives are rated for power at the rail,   
   while diesel locomotives are rated at the prime mover (you lose   
   approximately 15% to parasitic loads and transmission losses).   
      
   So, two 4400-hp diesels are approximately equal in horsepower to a   
   medium-power Vectron (and a 6.4 MW Vectron would be nearly 2.5 diesel   
   locomotives).   
      
   Tractive effort: starting tractive effort for freight AC diesels   
   approaches 800 kN.   
      
   N.F.   
      
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