I have the Trainz World Builder Edition and I have been attempting to build a custom route. When my route gets to be about 5 miles long, when I try to merge a new block of land with the route, it takes a long time to merge and sometimes it crashes. After this starts happening, my route will not even load. I have tried reinstalling the game and the same thing is happening once again. Just out of curiosity, I tried merging a new block of land with the Marias Pass route since it is by far longer than 5 miles and it loads up just fine. Any ideas?