Well up here you get to hear them scream given you take a bus that's probably never been over 40mph more than a handful of times..and put it on roads that are either national limit or steep up or down hill.
They are either riding the brakes down hill or flat out..
We don't have these trains...what are they?
Here we have a lot of rural routes so its not uncommon to see a double decker doing 60 on its way to great Yarmouth up the A47. on its way from Norwich.
They also operate them to a lot of the larger towns and villages out in the countryside.
I suspect the ones that go the longer distances at the higher speeds are geared or tuned differently as they never use the "local" ie in city buses for these longer distance services and they seem to have their own dedicated fleet.
I just now tried to look into the trains, they began the roll out of the brand new trains just before Covid. The old ones being retired off as the new ones came in. I seem to remember at the time the articles said a lot of the trains would go off to Transport for Wales to replace a lot of their "Pacer" trains which were trains made from the body of a 1970s Bus.
I read recently that a lot of old UK trains are being sold off to developing countries, so the intercity 125 that I use to travel back and forth from Iondon to Cardiff on, can now be found in Mexico, and often still in the operator colours of the UK companies because they just put them to work and didn't bother replacing them.
There is also talk that the old 90 Class trains that used to operate between Norwich and london (basically an electric version of the 125) may also soon be retired off and sent abroad.
Ironically if you drive to Great Yarmouth there is a growing number of very old train carriages just out side the main station, from these older trains, that I suspect are their due to their proximity to the Port in Yarmouth, so they can easily move them to the dock, load them on a ship and shift them abroad without taking up space at a more important or busy port.