Some freight railroads and transit agencies do not maintain their grade crossings as well as they should. Near me, they replaced several worn out & uneven nylon panels back in 2005 with extremely sturdy steel framed concrete panels. All of the crossings they worked on are far safer to ride/drive etc over, not only because it's more level, but the concrete gives you traction. Here's hoping they will do same with crossing in question, especially since those at more extreme angles tend to be more problematic than those at 90 degrees. Only other option is to build a bridge or underpass, or some combination or both, but not always a option due to cost, clearances, geology etc.
Bike tire/wheels are very stiff compared to automobile/truck/light truck tire/wheels, so they are going to be more prone to have things guide them off in a particular direction.
- Andy