As I had written in the blog posting You can never have too many people I had been using Wathers Goo for attaching N scale figures to the modules. It was suggested that I try a product called "E6000" which is available from a specialty plastics store in my area.
As you can see from the photo of the tube on the left, I have been using it for attaching more than people. It is clear, sets up in just a few minutes, and then cures in about 12 hours. It holds firm for as long as you want, but can still be removed without damage.
So far some of the applications I've found for E6000 where I had previously used Goo are securing decoders and wires on DCC installations, attaching vehicles and other details to the modules, and securing headlight lenses inside locomotive shells.
In this application I had removed the stock ties from a section of Atlas code 80 flex track and used the E6000 adhesive to attach the rail to the bridge ties that came with a Walthers bridge kit.
And it works great on N scale people too.
I bought the E6000 adhesive at Tap Plastics. They are not a large chain and are only on the west coast but they will do mail order of it to the United States and Canada.