Railperf
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- 30 Oct 2017
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No. UK railway standards state there can only be 3 posted speed limits. The standard Permissible Speed (PS) on the WCML is for all trains. In certain places there is a single Enhanced Permissible Speed (EPS) limit for both Class 390 and 221. In some places there are two EPS limits - the lower EPS speed limit applies to Class 221 only.I seem to recall reading in the 805/807 thread that the voyager EPS differential was to remain, and instead that MU speeds won't exist where the voyager differential currently
The introduction of Multiple Unit (MU) speeds will see the lower EPS limit removed. In practice that means PS limits throughout with additional sections of EPS for the tilting 390's and in some cases a few additional smaller pockets of MU limits. That means if tilting Class 221's are are reintroduced on WCML services, then they would have to run to either PS or MU speeds south of Weaver Junction. But a 221 can run at EPS speeds north of Weaver.
It hasn't been clarified whether 221's could run at EPS speeds over the sections where previously there was only a single EPS limit for both 390/221 but I guess that adds too much complication and isn't required now anyway.