This report demonstrates the capacity impact of running 110mph trains on a 125mph (tilting) railway.
Each 110mph path consumes 2x125mph paths between Euston and Milton Keynes, and there's a table of the incremental differences further north which reach 12.5 minutes at Weaver Jn (for Liverpool) and 16.5 minutes at Carnforth.
WMT operates three 110mph services out of Euston on the fast line, and GC will operate one.
Given the WCML is "full", it shows the folly of TOCs not ordering more 125mph tilting trains (or clearing more of the WCML for 125mph for non-tilting trains).
Makes you wonder why WMT has ordered new Aventra trains capable of no more than 110mph, thus perpetuating the status quo.
No mention is made of any plan to revise the speed restrictions on the WCML for non-tilting trains.
Other interesting nuggets are that the power supply at Crewe is near its limit, and a new feeder station is going in at Curriehill (on the Carstairs-Edinburgh line), which will allow more electric services in that area.
The WCML power supply upgrade from Euston to Great Strickland (Penrith) is also said to be incomplete.