Is that true at 7k ft on a train line that only has 1 train on it? I can understand next to a busy freight line or something like that but it seems like freshly

Is that true at 7k ft on a train line that only has 1 train on it? I can understand next to a busy freight line or something like that but it seems like freshly blown snow (to the volume that it stops a train) wouldn't have much in it. I can't say I know the purity of snow at that altitude though.