New Luas trams with 5000 registration numbers

[Towger]

I have noticed new Luas trams on the Green Line with registration numbers in the 5000 range. Were these trams originally destined for one of the new (now delayed/cancelled?) lines? As one would assume new trams to cover the Green Line extension would continue to use the 4000 range.

 

[markpb]

Apparently they were ordered specifically for the Green line and it's extension. When they're all in revenue service, all the 4k trams will be moved to the Red line to service it and it's two extensions.

They're pretty much identical - just 3m longer, slightly different seating configuration and step-free aisle along the entire length. They also have a louder bell that seems to trigger a spree of bell ringing from all the drivers and an ugly snout on the end.