Steel or Nickel Silver rail?

This project has stalled a little since my last post, mainly due to time sent posting items on eBay in order to raise much needed funds. There was also the hosting of March's Scalefour Cumbrian Area Group meeting. During the meeting, I received some very helpful ideas about problems I was foreseeing with Rospeath Lane. 

The main decision I was facing was what rail to use. This dilemma had been created after getting Tredethy Wharf out of storage. Much of the steel rail had deposits of rust. At our previous house, the layout had been within the house in a central heating room. Since our move to Cumbria, my hobby room is now a Log Cabin in the garden. During the reorganisation, the log cabin (after it was used for furniture storage) I noticed that some items felt a little damp. Finding rust on the rail should not have been a surprise but is a big concern for Tredethy Wharf's future. I'd been planning on using steel rail for Rospeath Lane especially as I've a good amount of steel rail in stock. On checking this stock of rail some had also gained patches of rust while being storage. This was not good I thought...

So what to do? Would running a dehumidifier in the cabin stop the rust, or should I use Nickel Silver rail instead? During the meeting it was mentioned that high-Ni Nickel Silver rail has an appearance more like steel than standard Nickel silver. I was not aware of high-Ni Nickel Silver rail before but it does sound to be the solution, so an order has been placed. In the meantime, I do have some standard Nickel Silver rail in stock which I might use for the coal sidings at the back of the layout. I'll make that decision when the high-Ni Nickel Silver rail arrives.