That is odd. Perhaps emissions credits like GE is using in the US?
Vossloh are continuing to build the EuroLight, at least the UKLight version meeting EuroIIIB with the addition of SCR with urea injection.
Presumably the 710 could also be equipped with SCR and urea injection to allow it to meet EuroIIIB. US railroads don't want to use this solution but that doesn't mean it wouldn't work. The different locomotive utilistation practices in Europe may make this an acceptable option.
The Euro 4000 is a lot larger in profile than the JT42CWR and this might make the addition of SCR practical. It can't take up too much room if it can be fitted into a UKLight, even with the smaller C175 engine.
M636C
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