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Talgo Designed Locomotive - 501 Calamity

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[quote user="Overmod"]I think you mistook what I said.  The speed restriction at the point of derailment is dictated by track geometry: it is nominally fixed by rule at 30mph regardless of the type of train, perceived passenger comfort, or whatever.[/quote] Might be. Every curve speed restriction is dictated by track geometry. There is a speed at which the rolling stock will just stay on the track or just tip and there is the speed limit dictated by lateral acceleration limits to protect the load, passengers or freight. The latter is lower. And that is not different at that curve. Even on a curve without super-elevation a tilt train can go faster than a conventional train. For me the same speed limit for conventional and tilting trains indicate that the tilting isn't activated at 30 mph. The following publiction shows on page 7, 3rd column at the top, that the tilting system is activated at 70 kph. Sorry it is in German. I didn't an English counterpart: <a href="http://www.talgo.de/download/SDNetzel.pdf">www.talgo.de/download/SDNetzel.pdf</a> [quote user="Overmod"]I do agree that either prototype I named could have had its CG reduced still further, probably at the cost of some additional sprung weight, were that desirable; perhaps a better example was the RP-210 with the Mekydro 'powered truck' which consciously put the components as low as possible.[/quote] I think it is a moot discussion. If you take a current locomotive like the quite low Siemens Charger you can be sure the designers tried to get the CG as low as suitable within the given specification. Active tilting for DMUs (the whole train) with underfloor engines is an option and there are examples in Europe. Regard, Volker
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