And Andy McDonald, the Middlesbrough MP▸ , said: ^The performance is shocking. The travel time from Saltburn to Darlington is 53 minutes.
... and how much better would it be with a 150 / 153 / 156?
There are some sections of track where Pacers are restricted to 20mph, where a Sprinter could safely run at 50mph but if there's an extended section of over a few miles where that happens Pacers are kept off the route and it's timetabled to be operated by a 150. Blackburn to Clitheroe used to have a section like that until the track was upgraded a couple of years ago.
Analysis on Chester-Altrincham-Manchester services by
TfGM▸ suggested that replacing 142s with 170s could shave 5 minutes off the journey time (6% of the total journey time) on an all-stops services and apparently the 170s have very poor acceleration compared to the 172s. The analysis was done before 172s were built so maybe by replacing 142s with 172s you could save 10% of the total journey time.
I'm not 100% sure how TfGM came up with that analysis as
AFAIK▸ a 170 has never run along the Chester-Altrincham-Manchester line but a variety of
DMUs▸ and locos have past and present from Pacers, Sprinters, 175s, Voyagers, class 31s 57s, 60s and 66s.