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This is a 27 foot main post bracket signal with a lower dolly post on the right hand side printed in White Natural Versatile Plastic (previously called White Strong and Flexible - WSF) material.
The bracket signal post was usually used to indicate which track a train would be entering either the main line or the loop. The bracket could also indicate entry to other tracks or be a Home/Starter signal where there was restricted space. Signal post heights indicated the status of the track they were protecting. Similarly, signal arm placements and sizes followed the same rule.
A set of detail parts containing a 39 inch signal arm and a 30 inch arm, other details such as finials (Finial - officially known by NSWGR as a Pinnacle), lamp tops, lamp 'backlight blind', cast ladder base and counterweight levers is included with this signal. A spare part for the finial, lamp top, lamp 'backlight blind' and counterweight lever is included.
A ladder for the signal is also needed and a sprue of two 21 foot ladders printed in Smooth Fine Detail Plastic (previously called Frosted Ultra Detail - FUD) acrylic material can be purchased from this Signals Branch Shapeways Shop. 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 Also required are some 0.015" phosphor bronze wire for operating rods, handrails and several small screws.