ISTR hearing this sound (compressor air system pressure venting) when the Citaros were operating on the TEN and being told it was 'normal' (as a retired vehicle engineer I didn't agree).
The system should vent when it reaches full pressure, but (in my experience) isn't normally so audible unless there is a fault. Not all Citaros made this noise, otherwise I would have accepted that it was normal.
This noise was around the nearside front wheel, so probably something to do with the kneeling function.
RE: Go North East - Latest