JRinTawa said:I don't have experience in running trains in such cold temperatures but have found dew (rime?) will affect running and more so on some loco's than others. Hope that's of help
I thought of Rime because Rob said the track felt cold and clammy.
Rime is a frost that has a liquid state by condensation before freezing, depending how saturated the air is etc etc.
The only way to prove it is to wipe the track and wheels when it happens and see if the loco runs better.