with the route North Eastern Rail Works - NERW - Version 2 - PA Division Route Files, http://vnerrforums.com/nerw/index.php/routes/nerw-pa-div,
I have sometimes enormous black plan correlated with traffic road. No errors displayed in Logmate. I feel that some animated vehicles seems based on the location of the road generate a huge black shadow

and few seconds later, the same green vehicule:

Howto solve this problem: vehicles or roads properties ?