So on the back of Arriva Northumbria's new order, I do have a question.

How come 6338-40 sound slightly different to 6341-55? 6338-40 have that more "hummm" like the Classic ZF E400s where as 6341-55 have a more B5TL/B9TL like rhythm.

Do the gearboxes in 6341-55 have a different profile setup? I know there was complaints about the retarders in 6338-40 during the first lockdown when they operated the special 45 and X30/X71.