those rails are a blast. but like stated, its just a ollie on. if you arnt comfy ollin subconciously, g practce, and ollie over ever lil chunk of snow/ obsticle you can find, until you no longer have to think about what your doing.
now that you are comfy, just come in fairly slow, and at a SLIGHT angle to the rail. ollie up and out onto the rail. i actually think this method of gettin onto rails is easier than jump on, especially for down rails. it also lets you get real low on um, which reminds me. come iinto the rail in a fairly low stance. this will help you pop up onto it.