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Challenger 601 series differences??

From what I see, there are many variants of the 601 series. The 3R, 3A/ER, 3A and 1A. So what are the main differences between?:confused:

Cheers
JP

from Wikipedia:

CL-601

CL-601-1A: refined version including winglets to reduce drag and more powerful General Electric CF-34 engines. (66 built, including 4 Canadian Forces CL-144/ CC-144B)[2]
- CL-601-1A/ER: 601-1A retrofitted with an additional fuel tank in the tail
CL-601-3A: engine with a higher flat rating and a glass cockpit. This was the first version marketed by Bombardier.
- CL-601-3A/ER: 601-3A with an additional, optional fuel tank in the tail
CL-601-3R: the tail tank was made standard, and airline style "unsided" engines (no left or right) were used, matching what was used on the CRJ.

hope this helps.

Damn Wikipedia!

I always think it doesnt know much about aviation! Wrong...

Thanks