Plowing invisible snow

Hi All,
After completing a long streth covering the whole Donner Pass route in the spring I was ready for something completely different.
So I set up a Feather River Canyon winter scenario, which runs fine, but it seems the locomotives are plowing invisible snow.
Is there a setting somewhere that I should change, or is this a glitch I just have to live with ?


After completing a long streth covering the whole Donner Pass route in the spring I was ready for something completely different.
So I set up a Feather River Canyon winter scenario, which runs fine, but it seems the locomotives are plowing invisible snow.
Is there a setting somewhere that I should change, or is this a glitch I just have to live with ?

