The relatively new stopping trains here accelerate at up to 1.0m/s^2; using that as a figure (because it's nice and round), and where 79mph ~= 35m/s (to 2 s.f., as are all derived figures below):
It takes 35 seconds to accelerate up to top speed, in which case it has travelled 610m. The distance of the track is 25 miles (or 40km), and assuming it maintains the top speed throughout and deceleration matches acceleration for comfort, then the journey would take 19 minutes.
If we take the lower value of 0.79m/s^2, which is what the newest intercity diesel trains do:
It takes 44 seconds to accelerate up to top speed, in which case it has travelled 780m. The journey would take 20 minutes.
Okay, these are somewhat optimistic assumptions, but the European in me would be surprised if there were that many places where it had to slow significantly, and obviously they don't actually have linear acceleration (we're talking closer to 60s to 60mph in the diesel case in reality, though the additional acceleration to 79mph is likely near the maximum acceleration give the reason for the prolongation is reducing jank).
It takes 35 seconds to accelerate up to top speed, in which case it has travelled 610m. The distance of the track is 25 miles (or 40km), and assuming it maintains the top speed throughout and deceleration matches acceleration for comfort, then the journey would take 19 minutes.
If we take the lower value of 0.79m/s^2, which is what the newest intercity diesel trains do:
It takes 44 seconds to accelerate up to top speed, in which case it has travelled 780m. The journey would take 20 minutes.
Okay, these are somewhat optimistic assumptions, but the European in me would be surprised if there were that many places where it had to slow significantly, and obviously they don't actually have linear acceleration (we're talking closer to 60s to 60mph in the diesel case in reality, though the additional acceleration to 79mph is likely near the maximum acceleration give the reason for the prolongation is reducing jank).