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Talgo Designed Locomotive - 501 Calamity

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[quote user="7j43k"]I do wonder at the why's and the details.[/quote] Perhaps a Talgo patent published in 1979 contains some information: <a href="https://www.google.com.pg/patents/US4041878">https://www.google.com.pg/patents/US4041878</a> In this patent the use of adjustable diaphragm air springs is described. Quote: In this particular case, and following the normal layout, each spring has a level adjustment valve maintaining the spring height. The operation outlined herein is for a straight track. When negotiating a curve, the valves close and the springs are distorted vertically until the torque produced by centrifugal force is balanced, thus resulting in the tilting of the coach. When travelling around wide curves as well as at low speed which has little effect on the tilt of the coach, the operating conditions are the same as for straight-line travel. Closure of the valves can be effected by electro-magnetic means controlled by equipment which senses whether or not the curve radius is smaller than the predetermined limit and whether or not the speed is in excess predetermined limit which are the conditions to be met for the valves to close. These simple means are described in greater detail at a later stage........ Speed can be determined by any known means, such as by an electrical generator 6 located on a wheel shaft, to produce a signal (voltage) proportional to the speed. On reaching a given voltage level, a relay 7 closes a switch 13 in the control circuit, which remains activated in the event that the train reaches a curve having a suitable radius. The curve radius is detected by the relative angle between coaches as they enter a curve for instance, using the relative displacement of adjacent coach front ends. On reaching a minimum stipulated movement corresponding to a particular degree of curve radius, one of a number of switches 8 in respective curve sensors 10, 10' closes, and remains closed providing the relative longitudinal movement does not drop below a given predetermined minimum value................  End of quote I think that answers the questions. Regards, Volker
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