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Originally Posted by Richard Eade
The design of the IPONAM was the direct result of the requirements that Ottawa put forth for its Light Rail Vehicles. No existing bogie could satisfy those demands so Alstom set about creating one. But with the short lead time to delivery, Alstom relied on modifying existing designs.
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Generally speaking, most components on a commercial produced vehicle will be adapted from existing designs. "Clean sheet" redesigns are rare, and Alstom had a platform of vehicles to build upon.
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Handle tight curves:- The carriage would be supported on a central pivot on the bogie, allowing the bogies to turn to better follow the tracks.
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The Citadis Spirit bogies do not pivot, which makes me question how many of these details are actually accurate and aren't just the assumptions you've drawn from the years of poor quality info floating around the Internet.
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