The YouTube video of the Swiss Albula Railway to which I posted a link in my comment above to illustrate how we can avoid being derailed off the primary topic in this thread (by placing the heavy electric locomotive at the FRONT of our train of thought in difficult weather conditions) is, in and of itself, a remarkable find and well worth viewing in its own right.
It never occurred to me, until I came across this video quite by chance, that someone somehow was motivated to and managed to get themself and their hi-rez 4k 2160p video camera on board the locomotive of a train as it began its journey through the Swiss Alps in midwinter.
The planning, surveying and engineering that went into the building of this world-heritage railway way back in 1903, is nothing less that spectacular. The builders, with the limited tools they had available to them at that time, nonetheless let nothing deter them from their determination to build their line to completion. If they ran head-on into an impassable mountain, they tunneled straight through it. If they reached a point where they had no choice but to gain or reduce altitude to continue along their surveyed route, they bored spiral tunnels inside a mountain, like a corkscrew, to solve the problem. They built massive stone viaducts across valleys, and snowsheds (galleries) above the tracks where avalanches were a constant threat. You get to see all this for yourself on this journey - if you choose to watch this video, be sure to start it at its beginning - YouTube has a way of landing viewers in the middle rather than at the starting point of its videos.