By the by...How can that be considered "at speed"? I know that the train's speedometer isn't visible in that video, but it didn't look any faster than 30mph to me...
The ayrline is moderately faster than many other routes in the UK, between Shields and Kilwinning the line speed is typically 90mph
Shortly after electrificaton was completed and when the Class 156s were new I was on one of the first Stranraer - Glasgow services, which was a pair of Class 156s
It departed Girvan 40 minutes late and by Kilwinning was only 25 minutes late, although the driver overshot the platform by one entire coach length, narrowly missing passing over the signal at green
The driver then managed to attain 90mph all the way between Glengarnock and Paisley and again just before Shields Road, with arrival in to Glasgow just 10 minutes late