(09 Aug 2015, 1:05 pm)Jimmi wrote Front windows on Go North East's Presidents often do this, especially on the X21.
The first batches of Gemini 2s that GNE ordered used to do this. The front-most windows would slam at speed. I assume WrightBus identified it as a design fault though, as the latter batch (i.e. 6084-6117) no longer have this opening window.