clouds
cold
copy
covered
dangers
disappear
early
express
first
fog
foggy
frozen
going
guardsman
leading
light
limited
lines
mainline
morning
natural
nature
oblivion
old train
precautions
railroad
rails
railway
safety
scenery
season
seasonal
sight
snow
snowy
space
steam
terrain
tracks
train
transportation
transporting
travel
vision
weather
white
winter
wintry