The length sounds right for the Roger 800s in Sydney.
I was thinking it might have been a 1000 myself. But the specs for this unit as printed on the side sill say it's 22.87m long overall with a height of 4.115m and a tare of 65 tonnes.
Wheel diameter of 920/840mm.
It must have been on order for a while, the Mermec RCDU has a date stamp with BHP of 2014, while the ELH bogies are stamped 2015.
They tend to look small next to 8 car A sets...
The Sydney cars have a dark blue stripe down the window band which makes the number of windows less obvious.
Does that mean the EM80 will be retired? It was the only one with laser rail head measurement...