There's just the one each way: in the morning there's the
1K14 0525 Blackpool North to Crewe, which joins
1R13 0448 Holyhead to Euston to arrive in Euston at 0834. This replaces the current 0535 from Lancaster.
In the evening, there's
1P21 1633 Euston to Blackpool North, which currently terminates at Preston. In both cases the train runs ECS from/to Crewe CS.
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The LM changes are reasonably extensive, particularly in the evening. In the morning, the main change is the addition of two non-stop trains from Northampton to Euston: the
0518 Crewe-Euston and the
0633 New St-Euston both run non-stop from Northampton to Euston, crossing to the up fast at Hanslope Jn, the latter with a very impressive timing of 46 minutes.
In the evening peak the
1746 and
1849 from Euston now running to Crewe, the former via Weedon though the latter still goes via Northampton. (The 1746 doesn't call at Stone, Kidsgrove or Alsager, so I'm guessing it's an 8-car.) These are followed by a
1749 and a
1852 to Birmingham via Northampton.
Furthermore, the 1713 and 1813, which were 100mph paths, have been replaced by two pairs of 110mph paths: there's a
1713 to New St, first stop MK, followed by a
1716 to Northampton. Similarly, there's a
1813 to New St (which is perhaps unique in calling in platform 6 at MKC and crossing at Hanslope!) followed by a
1816 to New St, which ends up in New St about 20 mins behind the 1813.
All told the changes make the fast lines out of Euston in the evening one of the busiest mixed-traffic timetables in the country - on Fridays, when there are two Virgin extras, I count 16 fast line departures from Euston between 1800 and 1859, up from 14 at present. Is that perhaps the most departures on a single track from a London terminus in one hour?