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| Signal PR38 Today at 00:09 #159171 | |
TUT
523 posts 
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I'm rather intrigued by the meaning and function of the sadly departed PR38 at Par and wonder if anybody knows. PR38 was the disc mounted below PR55 (and in reality PR50 on the left). Its plate identified it as disc up main home or to up branch. This I have to say intrigued me a bit. It suggests (and SimSig's implementation seems to support this) that it functioned as a calling-on signal. Slightly unusual, I believe, for a disc to be provided as and instead of dedicated 2-ft calling on arms below the main arms, but far from unthinkable. What interests me further, though, is the pull plate. It required 37 (the lock on 36 points, the up main to up branch facing crossover), which makes sense, but also interestingly 13 (the (latterly spare, but worked to maintain the locking) lock on 12A, the mains facing crossover on the London side of the station. For a calling on signal to need facing points some 75 yards beyond the next main aspect bolted strikes me as more than a little unusually cautious. If your calling-on movement reaches a set of facing points 75+ yards outside the station it's already had quite a serious impact! It occurred to me that it could be that 38 would clear with 21 or 24 (the discs below the starting signals PR54 and PR52 respectively) off to perhaps aid shunting in some way but SimSig's implementation does not support that. Anybody know what it was for and how it was used? Log in to reply |