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<p>[quote user="charlie hebdo"]</p> <p> </p> <div class="quote-header"> </div> <blockquote class="quote"> <div class="quote-user">VOLKER LANDWEHR</div> <div class="quote-content">The european railroad decided to use locomotive drawn train up to 200 kph (125 mph) and above that trainsets. I believe reason was, among others, the axle load limit which only allowed limited power installed in a locomotive, not enough to propel a train to 300 km/h (186 mph). The limit seems to be about a maximum of 6,400 kW as in Siemens Vectron, Bombardier Traxx, and Alstom Prima II locomotives.</div> </blockquote> <div class="quote-footer"> </div> <p> </p> <p>Would that possibly have been the reason why the Acelas were chosen rather than locomotive-drawn cars?  Perhaps also why the original higher speed equirment in the NEC NYC to DC on the PRR was Metroliner trainsets?  Higher top speed and better acceleration?</p> <div style="clear:both;"> </div> <p>[/quote]</p> <p>I would assume it. Acela Express has 4,800 kW per power car and 25 tons axle load.</p> <p>There is a criterion, the P2-force, new locomotives need to comply to. There was a discussion of allowable speeds for a dual-power PRIIA locomotive on basis of existing designs. The Siemens Charger complies for 125 mph, the additional loads for shoe pick-up would reduce the compliance speed to 110mph.</p> <p>[quote user="charlie hebdo"]Perhaps also why the original higher speed equirment in the NEC NYC to DC on the PRR was Metroliner trainsets? Higher top speed and better acceleration?[/quote]</p> <p>Here I think it was the weight and volume of the electrical equipment at that time. An Amtrak E60 (1972+) has 4,500 kW and weighs 387,000+ lbs on six axles. The Metroliner cars needed about 1,650 kW per two cars. Axle loads were 20,75 tons. I think it was easier to spread the electrical equipment over all cars than putting it into a locomotive and pull 6 cars.</p> <p>To come back to the Budd Metroliners. They were designed for 150 mph but limited to an operational speed of 120 mph (190 kph).</p> <p>On a Trains website is some history of the Metroliner train: <a href="http://trn.trains.com/railroads/2006/06/metroliners-amazing-career">http://trn.trains.com/railroads/2006/06/metroliners-amazing-career</a></p> <p>It give different travel time over the time.</p> <p>- October 29, 1967: 3:20 hours travel time NYC to WA, DC<br />- April 2, 1969:____2:30 hours non-stop<br />- October 26, 1982: 2:59 hours with 2 intermediate stops</p> <p>With speeds of only up to 120 mph the curve speeds must have been higher I think. Acela Express takes 2:58 with 5 intermediate stop at max. lateral acceleration of 0.1g.</p> <p>I asked before, can someone tell the allowed lateral acceleration in 1969?<br />Regards, Volker</p>
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