fog
yes rockrats thats a great story re fog at high speed...
like driving yer car too and u look at the speedo and its 40-50 mph you feel nothing and u cant see 50 yds in front,
then a very weird feeling and i guess in your train u must be cr***ing yer pants?
do you not have to slow down the train in extreme vis?
i guess the colour light signals have good fog intensity,