Cmdrted,
the railing is made from thin paper strips, glued together with white glue.
I use 160gr. cardstock (basically the same weight paper that all the other parts are made from). That paper is soaked in plastik glue. I use the variety that comes in a small glass with a brush in the lid and "paint" the glue onto both sides of the paper.
When dry, the paper is cut into really thin stripes (maybe 0.25 mm wide) - sounds more scary than it is - try it for yourself. It works pretty well with a sharp scalpel and a steel ruler.
I then make a template for the railing and print it. On top of the printout, I put some scotch tape - that will keep the railing from sticking to the paper when being glued together. Then I build the railing, remove it from the tape when dry and put it on the ship.
For difficult shapes, I do not use a template, but build the railing in place.
Hope this helps,
Michael