Here is the walkway with the side railings.
First thing I noticed was the size of the thing. It was teeeeeny. Inside Blender (for Reloaded), you have to scale the thing so its HUGE! What I do as best practice is place a plane on the ground and scale this to 100x100x2 (blender units) - this is equal to one grid square in Reloaded.
I removed a LOT of unused vertices and faces. Firstly, I went into edit mode and selected everything, then went to 'mesh' at the bottom and went up to vertices, then chose, 'Remove doubles'. This removed somewhere in the region of 108-ish vertices. Then, I went through in edit mode and deleted all of the faces that were inside the model.
I just did a 'Smart UV Project' unwrap and applied a very basic rust texture to it (just for testing). Then, exported with the standard settings that I use for all of my models and created the fpe file for it. Voila, one perfectly working walkway. I think it could do with being a bit bigger, but, its a great model and I will leave the scale up to you.
I have set a password on the zip file (always want to protect other peoples media). I will PM you the password now mate.
I hope this helps give you some insight to helping you fix the other walkway.
Cheers
Jay.