Signal Boxes ...

 Completed the signal boxes (and in the process cleared up the rest of clutter on my Wargames table so I could fill it up again with more....)

The simple interior of one of the signal boxes

with the roofs on (these are removable, may add an interior light at some stage)

In position on the garage layout ...

The signal box that was in the garage has now been moved to outdoor layout (the old one from there is going to a new home).