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The CSX7000 series is relatively low volume, compared to 4K/6K series.
The CSX8000 is even smaller in production numbers.
I don't know what the sourcing is as of today. Both glas cars were developed for in-house production last decade... I don't know if they still support the in-house chassis fab.
The aluminum 7000s were based on a KMP platform, with a brief venture (7500 series) into rollers from an AC derivative company in UK.
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