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This is a NSWGR 27 foot high Distant Signal printed in Smooth Fine Detail Plastic (previously called Frosted Ultra Detail - FUD) acrylic material. The signal post has a mechanism to adjust and control the operation of the signal arm as well as detail such as many bolt heads, detailed parts and finial (Finial - officially known by NSWGR as a Pinnacle), etc.
A set of detail parts containing a 39 inch Distant Signal arm and other details such as a lamp top, lamp 'backlight blind', a cast ladder base and a counterweight lever is included with this signal.
To complete this signal you can purchase from this Signals Branch Shapeways Shop a sprue of two 21 foot ladders printed in Smooth Fine Detail Plastic (previously called Frosted Ultra Detail - FUD) acrylic material. Also required are some 0.015" phosphor bronze wire for operating rods, handrails and several small screws.
If you wish you could instead purchase an etched brass ladder.