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How involved do you want to make it? I can see it being easy or hard. Not every switch needs a signal too, just the interlockings and a fixed approach to enter the yard.
Everybody ready for this? Is your wallet ready for this, David? Here's how a certifiable signal nut would approach [pun!] this:1 & 2 - 3-aspect dwarfs for yard exit. Red if switch is aligned against you or block is occupied, yellow if #3 is red or lunar, green if #3 is yellow.3 - 3-aspect mast for siding* entry. Red if switch is aligned to siding and siding is occupied, yellow if aligned to siding and block is clear, lunar if switch is aligned into depot.* - I'm assuming the track between #4 and #8 is the siding.4 - Siding exit. Red if switch aligned against you or the block between #5 and #19 is occupied, yellow if next block is clear and #19 shows red on top, green otherwise.5 - Interlocking, this one is tricky. Top head: green if switch aligned to mainline and #9 not red, yellow if #9 red, red if the switches are aligned to an occupied track or any track other than mainline; other heads red. Middle head: green if aligned into reverse loop, it's unoccupied, and #15 is not red, yellow if #15 is red, red if loop switch not aligned into loop or loop track is occupied; bottom head red (top head conditions make it red anyway). Bottom head: yellow if aligned into siding, siding is clear and yard access is not diverging, lunar if switch is aligned to mainline and mill lead is aligned into the mill. Also allowable for bottom head to display lunar if whatever track the first two switches are aligned into are occupied, but that's a "dispatcher's discretion" indication and actual prototype rules are complicated.6 - Loop exit. Green if both switches are aligned properly, block #5-#19 is clear and #19 is not red on top, yellow if aligned OK, block clear but #19 is red on top, red otherwise.7 - Mainline switches protection. Green if all switches are aligned and #5-#19 is clear, yellow if block clear but #19 is red on top, red otherwise.8 - Siding exit. Red if switch against you or #10-#11 is occupied, yellow if switch aligned and top head on #11 is read, green otherwise.9 - Mainline switch protection. Works like #8.10 - Siding entry. Top head: green if all switches aligned through on mainline, #7 is yellow or green and block unoccupied, yellow if #7 is red, red if occupied or switch is into siding. Lower head: yellow if aligned into siding, siding is clear and switch aligned to the through route, lunar if yard access is aligned into yard and siding is clear, red all other conditions.11 - Interlocking, more trickiness. Top head: green only if all switches aligned to main, block is clear and #18 is yellow or green, yellow if same conditions but #18 red, red all other conditions. Middle head: green if aligned into loop, and loop (#6-#15) is clear, and #6 is yellow or green; yellow if #6 is red (everything else the same); red all other conditions. Bottom head: yellow if aligned into siding, siding is clear and interchange switch is not diverging, lunar if aligned into loop and switch aligned into mine, OR aligned into clear siding but interchange switch is diverging; red all other conditions.12 - Siding exit. Red if switch against you or #11-#10 is occupied, yellow if switch aligned and block clear but #10 is red on top, green otherwise.13 - Mainline switches protection. Red if either switch against you, yellow if switches OK and #11-#10 is clear but #10 is red on top, green otherwise.14 - Entry signal from mine (dwarf or half mast). Typically two aspects, red, and yellow or green. Red if any of the three switches are against you or #11-#10 is occupied, permissive (yellow or green) if otherwise.15 - Loop exit. Green if everything aligned, #11-#10 is clear and #10 is not red on top, yellow if aligned, block clear and #10 is red on top, red otherwise.16 - Entry signal from interchange, dwarf or half-mast. Green if all switches aligned in your favor, #19-#5 block is clear, and #5 not red on top; yellow if everything OK except #5 is red on top, red all other conditions.17 - Siding exit. Red if switch against you or #19-#5 is occupied, yellow if switch aligned and top head on #5 is red, green otherwise.18 - Mainline switch protection. Works like #17.19 - Siding entry. Top head: green if all switches aligned through on mainline, #13 is yellow or green and block unoccupied, yellow if #13 is red, red if occupied or switch is into siding. Lower head: yellow if aligned into siding, siding is clear and switch aligned to the through route, lunar if interchange is aligned, red all other conditions.19 Alternative, with three heads - Top head as above. Middle head: green if aligned into siding, siding is clear, interchange not diverging, and #12 yellow or green; yellow if #12 red; red all other conditions. Bottom head: lunar if aligned into interchange, red otherwise.There are 8 detection blocks: yard lead, both sidings, mainline between siding switches, loop track, and both end loops. Most of the detailed aspects are determined by switch alignments.I have probably missed something, and Adam (draskouasshat) may want to correct me on some of this. Also, failsafes nor grade crossing detection are not considered in any of this, so YMMV.Is your head full yet?
I respectfully disagree with #5 as it should have four aspects instead of three; the main and three diverging that are controlled by 4, 6 and 7 in the opposing direction.
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Topic: Need direction for installing signals (Read 8624 times)
