Exactly same on 700/717s. Terrible wipers. Fast wiper on the train is about as quick as slow wiper is on my car.
They also seem to struggle against the aerodynamic forces at higher speeds.
It's almost like the couldn't be bothered to design it and pinched an old design from a previous model.
And I'm not even going to start on the windscreen washers ineffectiveness.
Not like drivers need to see out the front as best as possible.
It always seemed to me that until fairly recently train wipers had only ever been designed about once. Someone came up with these horrible cruddy pneumatic things back when the psssht-thump noises were useful for scaring dinosaurs off the station platforms while the train was waiting, and ever since then whenever a new design of train has needed a wiper someone else has just scrawled "Standard pneumatic motor with No. 3 arm" on the drawings and ticked the box.
It's hard to see why they ever chose it at all unless the design was done so long ago that they still thought making a compact DC motor of a hundred watts or so was too difficult. It's not even an appropriate method for the application because the jerky movement is pretty much guaranteed by the torque on the wiper arm remaining the same regardless of how freely it's moving, so any excessive friction slows it to a crawl and then when it moves off the sticky spot it whacks over at a rate of knots. A series wound electric motor will automatically put out more torque if a sticky bit slows it down and less torque as it speeds up, so to a large extent it self-regulates to a roughly constant speed.
I took one of those pneumatic motors apart once. Full of ancient grease that had turned into glue and the internal friction was outrageous. Don't suppose that sort of thing is much help.
The useless washers certainly don't help. Do they even consistently put any detergent in them at all, and do they ever use something that actually works, or just that counterproductive blue muck they sell in petrol stations? Sometimes I've noticed a few bubbles on something that's been using its washers, but not always and only in comparatively recent times. (Tales of drivers calling ahead to the next station to have a mop and bucket ready...) And trains seem to have an unexpectedly severe problem with collecting a layer of sticky gunk all over the outside; the stuff they have to put in carriage washers to get the visible dirt off the paint needs to be a bit special, and I'm not sure how good it is for the rather specific and different requirements for cleaning glass and not leaving it smeary, or even if it leaves some residue which makes the problem worse.
I wonder if these days where there is an attempt at design the designers are handicapped by a tendency to base their ideas on what the system is supposed to do on what the system in their cars does. I always take care that mine is capable of washing its windscreen crystal clear, and I am more often than not horrified when someone switches their own wipers on to see them create a horrible smeary mess that makes things as much worse as better - and even more so when they don't understand why I'm saying "what a horrible smeary mess, how can you see through that?" If they don't see a problem with using so unnecessarily dysfunctional a system, maybe they don't see a problem with designing one...