Somewhat rashly perhaps <g>, recently I agreed to help someone plan the signalling signalling for his 4mm ex
-L&SWR-based layout. As sadly is all too common with such things, the trackwork has been laid already and only now is he trying to superimpose some signalling on it.
The location is an imaginery single-line branch terminus somewhere between Salisbury and Exeter, built by the L&SWR circa
late-1860s. As such the eventual signal-box might well have been a L&SWR Type 1, tho' the builder has some interest in using a Type 4 instead. The model is based in the BR period.
The basic layout is fairly straightforward, but there are one or two querks which could be signalled in a number of different ways, so I'd be interested in views from forum members please. There is a rough sketch HERE
of my initial ideas. Please note the following:-
1. I have not included any spares at this stage, just trying to get the basic numbering sequence right for the bare essentials.
2. For ease of the owner's modelling purposes I have ignored the possibility that there might well have been some push-pull levers.
3. The signal-box location might be at any of the places marked 'A', 'B' or 'C' on the plan - at the moment the builder has it at 'B', so I have worked around that.
4. To avoid 'clutter' I decided not
to have an inner home adjacent to shunt 13, but instead made 13 a 'running shunt' (as per Padstow). I have included shunt 14 as a 'draw ahead' to allow down trains to be admitted direct to the loop (cribbed a bit from Seaton).
5. I have assumed
that shunt 6 reads direct ahead towards 2, as well as across 8 into the dock siding, so that engines can shunt up towards 2 without the gates being bolted across the road (borrowed the idea from Wadebridge West).
It is the level-crossing which causes me the most uncertainty. The distance from shunt 13 to the gates is about an engine + one bogie coach on the model. If the SB was at 'A', then I would have a GF at the LC released from the SB and with slots on 2 and 14/15. If the box was at 'C' then I reckon that points 11 and 8 could be worked from the SB (akin to Wadebridge West again), but have a GF at points 4 released from the SB (as at Bodmin North). With the box at 'B' - hmmm - having a GF at the crossing as well seems a bit of overkill, so I am thinking of crossing-keeper to work the actual gates but bolt them directly from the SB (as at Glastonbury and Eggesford). What do you reckon???
Another complication is that a short distance up the line, but not
included in my sketch, is another LC which is assumed to have been a WWII addition for a new road to serve a wartime camp. In this case then I am assuming essentially a stand-alone GF with its own signals, but might it perhaps slot 2 as its Up Home instead and in turn have its own Down Home slotted by the SB as an Outer Home? Maybe in that case use that Down (Outer) Home to protect the LC nearer to the station and move 15 to locate with 13 (omitting 14 then) ?