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Originally Posted by PHrenetic
For the Spirit being different from the Euro model it is based upon.... AFAIR it is a matter of the electrics (wiring, wiring harnesses, switches, controls, voltages), electronics (computers (not Thales), sensors, displays, voltages), and even some of the mechanicals (bogies, wheels, etc), being converted to North American standards - which have and has caused problems in other manufacturers' trains and LRVs in the past, and will undoubtedly continue to do so.
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I know someone who used to work for Alstom and he said the Citadis family is more of description of the type of trains. Even in Europe, there are very significant differences in designs of Citadis trains.
He worked on the electrical side and all of the wiring needed to be converted from metric wiring to AWG. Similarly I can only assume the sheet metal needed to be converted from metric to Imperial gauges. This may sound trivial, but in my experience, minor changes in tolerances can cascade and result in a major issue (is there enough room for a slightly larger wiring harness, or will a slightly thicker panel fit for example). Couple that with different requirements for North American use (both safety and accessibility) and it was likely considered easier to design a new train from the ground up (using their experience and possibly reusing some components when possible).
The fact that they have 14 trains fully operational indicates to me that it isn't likely design issues but manufacturing issues. This can easily happen with any manufacturer, especially when using a new final assembly facility.
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As for those "2 extra" LRVs (one 2-vehicle train ?), that's what beats the snot out of me on this numbers game. We Shall See !?!
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Ya. I can't help but wonder if some sort of "accident" (or incident) happened that is being covered up. They likely either need significant disassembly to fix them or a significant number of parts need to be replaced to pass testing and sell them as new. The missing computers is likely just a convenient excuse (if you were missing 2 computers and had 2 trains that you weren't sure how you were going to fix, they would probably be assigned to each other).