trying to work out how you could do the whole north to south thing exclusively ö sprinters. First stumbling block is that the HML INV - GLQ is 170 opperated mainly. Thoughts?
158s are used to strengthen a select number of Highland Main Line services, so it would go something like this:
1. Thurso to Inverness: SR 158
2. Inverness to Glasgow: I don't know if any of the Inverness to Glasgow direct services use 158s for strengthening. If not, you would have to catch an Edinburgh train (strengthened with a 158) into the Central Belt, and then hunt out a 156 or 158 working a short distance service into Glasgow.
3. Glasgow to Carlisle via Kilmarnock & Dumfries: SR 156
4. Carlisle to Leeds via the S&C: NO 158
5. Leeds to Manchester via the Caldervale: NO 150/153/155/158
6. Get across to Chester from Manchester using a Northern service. There are some Sprinters make it out that way, right?
7. Chester to Birmingham New Street: ATW 158
8. Birmingham New Street to Worcester: Now that LM are in the process of getting rid of their 150s, this leg of the journey is a lot more difficult. I believe that there is still intended to be a single 150 diagram down to Worcester though when all the 172s are in service.
9. I think FGW 158s make it as far north as Worcester from Cheltenham. You'd need to take one of these south towards Bristol.
10. Various links between FGW 150s and 158s from Bristol to Penzance, and possibly an SWT 159. I don't know which sections of the South West (Cornish) main line the FGW local services cover, but I think you could make it all the way through Devon and Cornwall on 150s, 153s and 158s.