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St. Simon

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    Model railways
    Signalling

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  1. The driver does not have any controls to make any train make that sort of sound, the sound you are hearing is the DSD system working. There’s no need for the driver to make the OTMR aware of them acknowledging the signal, as recording of the AWS Cancellation button does that. The driver has to make their own sound for an aid memoir, there’s no in-built system for it. Simon
  2. You’re right, it is a strong coincidence, but certainly there’s no system set up like that. It is unnecessary as the AWS is a type of DSD, so you don’t need the DSD to check the driver is alert before going over a AWS. In fact, distractions purposely set up like that are discouraged by both unions and signalling engineers. It is just pure coincidence that the signal spacing, train speed and timing of the DSD is combining so the DSD bleeps just before the AWS Magnet. Simon
  3. Hi, No, I think it’s just coincidence that the DSD is bleeping just before an AWS Magnet. Simon
  4. Yes, the key is in the title: Guidance ;) I've changed a few symbols on my panel from the standards to make it look nicer! In terms of route lights flashing, I know that at Western Panels flash the first route light as a reminder for the signalling to cancel the route. Simon
  5. Hi David, Yes, as part of a ‘modelling the privatisation era’ book, in fact I might restart that book if there’s enough interest. Simon
  6. Hi, I assume that you are talking about the number of apertures that the signal head has, rather than the number of heads a signal has (unless it is 'co-actor', they usually have one)? One type is where you have an aperture for each aspect, these are almost all filament lamp (SL35s), but there are some which are LEDs (mostly from the Signal House Group range). The second type is the 'searchlight' signals which have one aperture for the Red, Single Yellow and Green aspects and then a second aperture for the double yellow aspect (if fitted). There are very few of the filament lamp 'searchlights', while the rest are from Dorman or VMS ranges. Dorman produce three types of LED searchlight, one is a lightweight type for 'standard' signals (which in themselves have two profiles for 3 aspect signals), one is their 'Integrated Lightweight Signal' and one is their 'Colour Light Signal'. The VMS range is just their 'lightweight' type. The LED searchlights are a slight minefield, you can find pictures of all the signal head types in Figures 37, 38 and 39 on pages 43 and 44 of my book. LED signals are now the go to type when a filament signal needs replacement, however, the choice between the types of LED signal is not really defined, it is mainly down either to choice by the signal sighting committee (although rarely to the SSC force a certain make of signal) or whoever, with whatever product, wins the contract for providing the signals for a project. If you go for models of Dorman 'Standard' Searchlights, you can't go far wrong. Simon
  7. Hi David, They will be lighting to be used during the night when possessions are underway or during patrolling, they are usually only found around junctions, but can be found in other strategic places. Originally they were introduced on the WCML, but now being installed at other places, usually when they undertaken an S&C renewal or other major works. Simon
  8. Hi, Thank you, nice to hear I'm not the only one who is interested in the subject! I wouldn't say that what I'm doing is 'fully prototypical', for reasons that I explained in the IECC thread, but I think it is the practically the closest thing you can achieve realistically without buying an actual interlocking. You don't have to write your owns software, as long off the shelf software can take physical inputs, perform [or] and [and] logic on them and then switch physical outputs (which JMRI can do), you can make it operate like an interlocking, However, there are a few things I have learnt from doing all the signalling which I can pass on to anyone hoping to replicate prototypical signalling as there's a difference between a prototypically signalled layout and a layout with a prototypical signalling system and making the former into the latter is not as easy as you think! You can't just build an NX panel (or any route setting panel) that simulates the operation of an NX Panel you've got to build a panel that replicates the operation of an NX Panel - There is some really quite complex logic behind the operation of the an NX Panel, and, whilst it may see overkill for a model railway, if you don't replicate that logic, you will find that your panel won't always work like the prototype, particularly when you don't always do things in the order that is intended. You can't just build the NX Panel and stop there, you need to build the interlocking behind it as well - Again, seems overkill, but it is the best way to ensure the prototypical operation of the signalling system, and prevent damage to stock though preventing collisions (just like the real thing). I've been lucky in that I have access to the typical circuits for a route relay interlocking, and this is where most people will fall down, typical interlocking circuits are not publically available, and certainly shouldn't be. Don't try and build a physical interlocking (i.e. out of actual relays) - It simply is not practical unless you are a real railway, after all, there is a reason that we build large interlocking rooms and spend lots of money when we build signalling systems in real-life. Use a computer (or micro-processor), to carry out your interlocking logic Don't try and build a physical panel unless it is for a very simple layout or you have a decent amount of space - The NX Panel for Collingwood was going to be over a metre long, anything small and it would have been far too difficult to build. Don't apply the signalling system to the whole layout - In theory, there is no reason as to why the signalling can't be used on the whole layout, but using it for none-scenic areas, such as a fiddle yard, isn't really needed, and just makes it more complex and expensive. Simon
  9. Hi David, Your plan looks fine. As you say, 1 should have a route indicator on it, which would be a standard route indicator (theatre box). For TPWS, their would be two loops, one for each signal, mounted a few metres on the approach to the signals in the centre of the track. The train will be able to detect which direction each set of loops apply to be sequence in which it detects the arming and trigger frequencies. Simon
  10. Hi, Over the last week or so, I've been trying to build Collingwood's Station Builidngs, however, I remembered why I much prefer kit building, I simply can't cut bare plastic straight or square! Last night I used a template from Scale Model Scenery, along with a square and a steel rule, to cut out the first two windows from the first wall, but they ended up not straight, not square, and nowhere near the size they should be. So, I'm going to have to try a different approach. Ideally a kit which is close enough to the below so that I can build / modify it would be great: However, I can't find anything like it from any manufacturers. I don't need all of it, just the main grey building and the first couple of brick buildings would do, however, the only kits for a single story building are all Great Western, Stone. or Wood Cladding. I don't mind if it is plastic or laser cut, just something close would do. Any help or advice would be greatly appreciated! In better news, the first signals, CD810, CD812 and CD814 have been ordered from Absolute Aspects, but I'm expecting these around Christmas as Matt has quite a work load on! I've also, as mentioned above, got some quotes for 3D Printing all the Lineside details I need, so hopefully that will be here fairly soon! Finally, I have constructed the Cable troughing from Scale Model Scenery, as well as Catch Pits. So far I have installed the Catch Pits, but I'm going to go and get some spray paint today to paint the cable troughing a suitable concrete colour and then install that. Simon
  11. Hi, That was my intention initially, in fact I almost got to the point of paying for it, but I realised that I don’t have a suitable location in the flat to operate it safely, so I haven’t yet. I’ve got a couple of quotes from companies, so I’m weighing up the options. Simon
  12. Hi David, Firstly thank you for purchasing the book, I know it might be a little too in-depth for some! There’s a few things to change: The Signal on the L/H of your plan with the junction indicator is right or wrong depending on the signalling in the yard. If you keep the ground position light with the RI, then the L/H signal would need a position light instead of a junction indicator. If you change the ground position light with the RI to a Main Aspect Signal (for leaving the yard onto the main line) with position light ( for moves into the next yard), then the L/H signal would be fine. Either way, I would move the signal protecting the R/H reception to main crossover to the left of the points for the siding. Also, depending on the length of your shunt line, then a ground position light might be need to control moves from the shunt onto the reception line. Other than that, I think it’s not too bad (assuming that the R/H edge of your diagram is the physical edge of the scenic section). As Flying pig days, if all lines are Bi-Directional, the signal on the Up Slow for moves from right to left might need a JI. I hope that makes sense, if it isn’t, I can draw a diagram tomorrow. (I’m writing this on my phone, and can’t draw a diagram). Simon
  13. Hi That's fine, I was looking more at them running through Fareham on the Cardiff - Brighton Axis. There's videos on YouTube of them departing Havant for Brighton, which I assume means that they went via Fareham, but nothing (that I've seen) to say they did go through Fareham. Simon
  14. Hi, I’m going to go slightly off topic, but did Wessex Trains run their 31-hauled stock on the Portsmouth - Cardiff runs (I assume via Fareham?) I can’t find any photographic evidence, but it seems that they did. Sorry to pull the thread off the original timescales, but it seemed the most appropriate place. Simon
  15. Hi, Yes, I have seen that and it looks fantastic, although having looked at the one at Fareham, it looks very much like the Bachmann Scenecraft version: So I might go with modifying one or two of those structures. Regards, Simon
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