Is this the steepest escalator?

It’s certainly the steepest escalator I’ve been on.  When Parliament Station, Melbourne opened in the 1980’s these were the longest escalators but didn’t seem to be the steepest.  They create a huge talking point with anyone especially visitors who travel on them for the first time.  They are quite scary but you get used to them. I’d love to know what the gradient is.  The advertising boxes on the side give an indication of the gradient.