I assume 18tph is from Euston-OOC-Birmingham Interchange (although not all stopping at Interchange).
With 8 platforms at Euston, then 2 lines to OOC (8 platforms), then 2 lines to just south of Birmingham Interchange, which has 4 platforms
3tph then go to Birmingham, leaving 15tph north of the Birmingham spur. Are there 4 tracks from Birmingham spur north to phase 2B? Or does that only allow 3 Birmingham starters
After the East/West split, that 15tph would then be
West 8tph
2tph Crewe-Liverpool/Lancashire
2tph Preston-Scotland
3tph Manchester
1tph Macclesfield
East 6tph
2tph Leeds
1tph Leeds / Sheffield
1tph York / Sheffield
2tph Newcastle
And 1tph reserved
What's the current plan for Birmingham starters heading north (rather than Euston starters)?
Will the East and West route be built for 18tph even though they won't have that many trains?
2 tracks from Euston to OOC
6 tracks and platforms at OOC
2 tracks OOC to B’ham Interchange
6 tracks with 4 platforms and 2 through tracks at B’ham Interchange
4 tracks north from B’ham Interchange
Birmingham branch tracks for south chord come off the outer pair, but 4 tracks continue north
Birmingham North chord tracks join (northbound on outside, Birmingham bound between the two ‘up’ tracks
6 tracks north for a kilometre or so where everything is ‘sorted out’
2 tracks to NE (northbound is track 2 looking from west to east, southbound is track 6)
4 tracks to NW, which become 2 almost immediately.