if you ask near by dry ski slopes and ask if they have any spare they usally do they might give it to you for free or make you pay and if your looking for a good rail just buy a cheap skate rail you can get a 7 foot portable one for like £30
snow fence is way faster. the only con is you have very little control of your skis when your on it. i found that putting snow fence over the turf makes you have a little more control and a LOT more speed. but if you dont have the money to do that, just snow fence cause its so damn fast.