In reply to MB42:
Thinking of train options for ice climbing in Europe. Using the excellent seat61.com.
If you get the first train of the day from somewhere in the south of the UK, you can be in Grenoble (for La Grave) that evening or Aosta (for Cogne) that night. Unfortunately they don't do 2-day Interrail passes, but even the 4-day one is only £191 in the current sale (£144 if you're <27). You need to pay a bit more for seat booking, but overall the price isn't bad, especially as (if you can WFH) you don't need to spend any days' leave while travelling.
Although you can get to Stockholm in 2 (full) days of travelling, realistically Norwegian locations are currently 3 days each way on the train. £260 7-day Interrail pass + seat bookings + overnight accommodation.