Both reckless and over-cautious are sins in a good Captain. Right now you have no need for speed, conserving lives now will mean that you can spend them in the future (if needed). The train comes to a halt, the skater cars spread the great wings of their tents, the kitchens feed everyone a meal, and you prepare to wait it out.
Afternoon and night pass with the howl of the wind to keep you company, but before the sun is over the yardarm the next day it is easing. About mid-morning you are preparing to move once more, and you get the news. Some idiot, despite all the warnings and precautions, has succeeded in getting themselves frostbitten. Right foot. The usual option is amputation, but Graf Anette tells you that she could use Electroconvulsive therapy to restore the limb. She will need to set up apparatus, you have used enough supplies to clear a car as an infirmary.
Frostbit - [] Heal them
4 of 5 hours (once-off) , 2 hours spark time per week. Science!!!.
Frostbit - [] Nothing doing
Amputate and move on.