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This is a NSWGR 27 foot high Distant Signal printed in White Natural Versatile Plastic (previously called White Strong and Flexible - WSF) 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) are included in 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 which is quite strong.
Also required are some 0.5mm phosphor bronze wire for operating rods, some brass strip for handrails and several small screws.
If you wish you could instead purchase an etched brass ladder. A suitable etched brass ladder and a ladder forming jig are available from Keiran Ryan Models: http://www.krmodels.com.au/7mm_kits.html Note: The Kerian Ryan Models etched ladder is 20 ft long so the ladder for this 27 ft signal may have to be made by soldering together two pieces to get the longer length.