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> Dcc Concepts Ground Signals
Richard Johnson
post 23 Aug 2018, 17:18
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*** Good to see you have them sorted.

They are to the drawings we have - one of several variants that existed between the 1930's and now. However the base is designed to sit into the ground / ballast, not on top of it, so your approach to fitting them is actually as per our intention.

We made the blocks presuming a 5mm track-base which is 15" in scale, and the real-world blocks we measured were somewhat deeper than that so if correctly mounted as per our cunning plan only appx 1mm would be visible on average. Those with nil or little track bed should probably dig into the baseboard top a little to mount them lower.

(The prototype uses quite deep concrete blocks to mount them, and in general only the neat little mounting plate and small legs on top of the block would be visible in many places)

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TimP
post 23 Aug 2018, 18:03
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Thanks Richard...

I'll post more pics in due course when I have the whole lot going...


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Bear 1923
post 24 Aug 2018, 06:57
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The concrete bases are (amazingly) "concrete colour" - whatever that is... Mostly light grey varying to yellowish-brown. Early PLGS were all black - facilitating their being tripped over when approaching from the back in the dark. More recently the back at least has usually been (very) light grey. Some variants are all grey.

Whatever anything starts out as the location near inevitably means that their colour gets modified - by dust or crud - and by any ballasting work around them. Thinking about it, PLGS don't get rusty - I guess that the mouldings/castings are some sort of alloy. (Very early ones might have been cast iron???)

I wouldn't be too worried about getting every PLGS in a cluster set at the "correct" height - the "vertical" position on the ground varies enormously depending on local conditions. (Including "wear and tear").
Two adjacent PLGS can be both in different states of repair and positioned differently (either deliberately or accidentally/by wear and tear).
The actual or apparent height can vary with much of the support block showing - either because it is set high or because the surrounding ballast is reduced.
The block can also have been set leaning back to project the signal aspects up toward cab windscreens at short range. PLGS also get knocked about a bit - tamping can shift the block a fraction so that it tips back or to either side (or any combination. Much tipping forward would normally be corrected.
PLGS also don't always aim straight along the track parallel to the rails. While this can again be due to displacement they may be set at an angle where the approach track is curved.

The general rule is that while PLGS all start out the same from the factory, on the ground they are very individual. Except for a collection in a new scheme there are hardly any two the same - and uniformity in a scheme doesn't usually last very long.

huh.gif Would the oval holes be a saw point?

cool.gif
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Bear 1923
post 5 Jan 2019, 14:14
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smile.gif Was there ever any progress on this? smile.gif
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