Originally Posted by Supahflid
Shouldn't be any trouble on a 990 as long as you are mostly ninety degrees or so to the obstacle. I have easily climbed sixteen, eighteen inch steps and bigger on mine.
I think OP is more worried about riding in
the tracks and then getting out at some point.
I think crossing rails like that with less-than-perpendicular rail/wheel angles is asking for trouble. And if you drop, your 990 is going to get rammed by the rail it falls on.
Like someone said earlier - I think your best hope might be to loft the front wheel over. Not sure what you do when the rear stays on the inside since it probably won't wanna bump over a slippery rail, at least not on a <90degree angle.
Not a rail but here's a log showing what I mean.