They do indeed - the Heart of Wales line services cross at either that location or Llandrindod Wells. Shrewsbury (and maybe Crewe guards but that’s by the by) crews work the service until the crossing point, then they swap trains with the Carmarthen crew from the other train and work the...
Derby wise it’ll be mainline from day 1 as a qualified driver I believe, up and down to London and Sheffield. Some local work to Matlock/Crewe etc but only in certain links, most work at Derby is mainline I believe.
A few gaps. Usual restrictions apply
Scarborough - Manchester Victoria incl Calder Valley diversion
York - Redcar Central plus loop
Manchester Victoria - Newcastle via Bradford and Elland
York - Leeds via...
https://www.whatdotheyknow.com/request/250035/response/611408/attach/4/Appendix II Mon to Fri Diagrams.pdf
https://www.whatdotheyknow.com/request/250035/response/611408/attach/6/Appendix III Saturday Diagrams.pdf