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Regarding 170s:
Transpennine Express said that using 100mph 185s and 170s would mean late running trains would be more likely to make up time over using 90mph 158s, so the same should apply on the Liverpool to Norwich route.
Regarding Northern's Manchester Oxford Rd to Liverpool service:
When I caught the 07:41 at Oxford Road one morning it was forced to wait until just after 07:45 as the 07:38 from Nottingham to Liverpool was delayed. The 07:41 is timetabled to arrive at Liverpool at 08:55. A Transpennine service is due to arrive at Liverpool at 08:58, so it's likely that a 5 minute delay to the Nottingham to Liverpool service caused two other trains to be late. During off-peak periods the timings aren't as close as the local trains are missing out more stations.
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