I've been riding my bike to work for a few weeks now, and even running some errands on it. It wasn't until yesterday that I first rode to the library on it. On the way there, there are some old railroad tracks that cross the road.

If I were on a freewheel bike, I'd just coast with my butt off of the seat. But the fixer (obviously) prevents this approach. I'd imagine this same problem occurs with people who ride fixed offroad. How do you approach it? Just stand up and charge through?