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[quote user="SD70Dude"]The Independent brake can be used at any time, regardless of how long a train is attached to the locomotive and whether or not the air is cut in to the cars, but applying it will cause the slack to run in, which at minimum gives a bit of a rough ride to passengers & crew and at worst can cause a train separation when the slack runs back out.  Proper care must be taken to avoid this. [/quote] One remark here, we don't discuss a standard American or European passenger train. The train in question is Talgo articulated train where the single cars are permanently coupled. Each car has only one wheelset at one end. The other end rest on the wheelset of the next car. The independently suspended wheels are steerable. That is achived by rod connections to the adjacent cars. There is not much slack that can run in or out:  <a href="http://web.talgoamerica.com/images/Techadv/TalgoTechnologicalPrinciplesBrochure_sized_opt.pdf">http://web.talgoamerica.com/images/Techadv/TalgoTechnologicalPrinciplesBrochure_sized_opt.pdf</a> So perhaps the train handling can differ from that of a "standard" train. Regards, Volker Edit: Here is the patent for Talgo's steerable wheels:  <a href="http://www.google.com/patents/EP1323610A1?cl=en">http://www.google.com/patents/EP1323610A1?cl=en </a>
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