These ladders have been designed for the range of HO Scale Fine Detail (FUD) NSWGR signals. The ladders are long enough to do all heights of signal posts in the range and include the cast iron ladder base.
These ladders can also be used to replace the ladders on the Signals Branch White Strong and Flexible 3D printed signals to increase the detail level. If the handrails on the signal platforms are replaced with wire a nice signal can result.
Of course the ladders can be used for other purposes as well.