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Talgo Designed Locomotive - 501 Calamity

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[quote user="7j43k"]The curve restriction would have been whatever management says it would be.[/quote] The speed restrictions for passenger trains are set according physical requirements and passenger comfort design criteria(limit of lateral acelleration and force). In our case it is set to 30 mph according to comfort criteria. If you are going faster the train exceeds the acelleration and force limits. To drive these speeds without exceeding these limits the carbody is tilted. It is a comfort system not a system to stretch the physis in the wheel-track plane. The center of gravity is moved to the outside by the Talgo (passive/natural) tilting system. It tilts about 3.5°. To compensate this the carbody is suspended low between the wheels (indipendent suspension) with a lower CG than on conventional cars. Here is a broschure of the Talgo 8:  web.talgoamerica.com/images/Amrak/Series_8_Brochure_sized_opt.pdf The tipping speed doesn't get higher. [quote user="7j43k"]We don't know what the design of the engine is/would be.  We do know that Talgo moves parts of their cars around for the convenience of passengers.  If they moved the CG of the locomotive inwards on the turn, it would raise the tipping speed.  [/quote] As said above the CG moves to the outside of the curve. Natural or passive tilting means the tilting point has to be above the CG. Getting down the locomotive floor between the wheels seems impractical. Talgo offers a locomotive:  <a href="https://www.talgo.com/en/rolling-stock/locomotives/travca/">https://www.talgo.com/en/rolling-stock/locomotives/travca/</a> It doesn't tilt, the power car of the RENFE 130 neither.  In the above linked broschure is a picture showing the speed limit sign for passenger and Talgo trains: P-65, T-75. The derailment curve speed limit is posted as P-30 and T-30. That leeds to the conclusion that the tilting system is inactice at 30 mph. In European Talgo trains the tilting systems gets activated above 70 kph (44 mph) In Europe active tilting trains are mostly DMUs and EMUs where the weight distribution allows tilting of the end cars. Regards, Volker
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