The Elizabeth Line: London’s Biggest Engineering Project

 https://www.youtube.com/watch?v=Yd4aYyxcoO4  

Secrets of the Elizabeth Line https://www.youtube.com/watch?v=IJrXeLPLcLI 

https://jfdatalinks.blogspot.com/search?q=The+Elizabeth+Line

Longer Trains for Crossrail?

 https://www.londonreconnections.com/2024/longer-trains-for-crossrail/

Ideally, it's always better to allow for enough future clearance for longer trains.

https://en.wikipedia.org/wiki/Crossrail

It's even better to have longer stations or at least a roughed out provision established in the first place.

https://www.londonreconnections.com/2024/bonus-trains-for-crossrail-more-details/

https://en.wikipedia.org/wiki/Crossrail#Route

https://www.ianvisits.co.uk/articles/more-elizabeth-line-trains-arriving-in-summer-2026-73566 

https://jfdatalinks.blogspot.com/search?q=The+Elizabeth+Line