First up, we have scalemodelscenery.co.uk with LX097-OO Tube Style Safety Railings. Roughly 558mm in length and 16mm tall, these are laser cut from laserboard. I like the joins between the tubes with representations of the joining tube bits. Possibly they are a bit modern for this boat, but they would be ideal for a modern image layout.
Ratio have also produced some nice railings.
All this is a lot cheaper than the turned brass from model boat people, no matter how nice it looks. After all, when you need railings, you need quite a lot of them.