JontyMort
Lead Service Attendant
They will have a max speed of 125mph just like the Amfleets.
And to bring the discussion back to the title - constraints on high speed running - whether increasing the top speed of the fastest trains gives value for money depends on whether you are in marketing or operations. Sure, 165 mph is sexy, but on a mixed-traffic line, easing of the worst low-speed constraints - be they pinchpoints or speed restrictions - gives a much greater improvement in overall operating conditions than upping the top speed, because all trains benefit.