Question for atvs on railroad grade

[PANKRATZ]

Hi all,
Looking at picking up a Arctic cat 1,000 side x side. We have a Razor rzrs at this time but was wondering if there is a max width on wheelbase that can be run on the grade. I understand forest trails are 50 max. I have been running for 2 years on my rzrs on forest trails with out any problems and the width is 60 inches. Any help would be great all.
Greg