I have never seen the double-hole stanchions, possibly from one of the German manufacturers? Some Marklin, Bing etc stations had closely spaced handrailings, but these were usually soldered in-place and painted.
The double solenoid, looks like it is from a bell tender or a semaphore. The rod with loop on the end is similar to the attachment in a Lionel 80 or 82 semaphore, but the solenoid and bracket are different.