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Martin Shaw

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About Martin Shaw

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  1. Richie I've found a drawing of the AEI/GEC version. This came in a number of variants but the most common single unit is 16.75" wide by 20.25"high and 6.25" deep. The hood protrudes 10.5" at the top and tapers to nothing 19" from the top. This for a single unit, the double unit is obviously enough twice as wide, there were also double sided versions and they could all be pole and gantry mounted. Hope this helps. I would imagine that Westinghouse and SGE units would be similarly dimensioned. Regards Martin
  2. Probably it was likely driven by the overall cost of the scheme, rather than a specific element appearing to be a significant addition. If you've ever had to deal with costing alterations on BR, the obvious is not necessarily the best, I remember such occasions rather too well. Regards Martin
  3. A thought if I may, the signalling at Crianlarich was significantly modified upon closure of the C&O to the east in 1965, and the section westwards extended to Dalmally. To allow for free acceptance when a train was accepted from Tyndrum Upper an additional outer home signal was provided which is the signal in Beast's pic. Electric token working was still in use in 1981 and I believe the situation with the Rule 55 exemption on the diagram was that there was a TC there before and when the diagram was altered the diamond removal was overlooked, or, the diagram had an addition that it didn't warrant. Regards Martin
  4. Andy Thankfully nowhere near as large, only 496 pages, but still around £85 to purchase. Britain is by American standards very small and has had the benfit of a centralised electrical generation and distribution system which has resulted in a countrywide standardised approach to electrical installations. I'm not for one moment suggesting that it is inherently any better that way, just the way it developed. In my opinion the ring final circuit is an historical throwback that should be outlawed, but we seem wedded to it. Regards Martin
  5. Ray Errm yes I'm afraid it has, four times in fact, 3 amendments to BS7671:2008 and BS7671:2018, although most of the variations are relating to zone sizes or RCD protection of final circuits, and are not retrospective. It is worth mentioning that part P of the building regulations only apply in England and Wales, Scotland sensibly does it differently. Regards Martin
  6. Your quite right, it hasn't taught me any respect for someone who despite many posts that they are wrong, continues to argue to the contrary. I have read your last post, I would suggest you speak with Charles Hudson MBE who can possibly elucidate you. In respect of your use of a track circuit example, of course when a train occupies it, the voltage drops and the current rises, because quite simply the resistance has fallen, it's no more magical than that, if you can't grasp this basic principle then there really isn't any point. Stop fighting it. Best wishes Martin
  7. I have read this thread with some interest, and after 47 years as a professional electrical engineer one of the few things I definitely know is Ohm's law, and it's application in any electrical circuit will always have the same impact, as many others have already made plain. However counter to this is the proffered argument by the Sussex flat earth society which goes like this. If you take a 100% efficient electrical device that can give a 1000w of output work, you have by virtue of Newton's laws to feed it 1000w of electrical energy that could well be in the form of 10v at 100A. If you halve the supply voltage to 5 and at that PD the device will still give 1000w ouptut then the current will indeed rise to 200A, this is of course nothing to do with Ohm's law, and everything to do with a change in how the device works which electric heaters can't do. On a serious note the issue isn't moulded plugs per se but the relationship between the plug pin and the wiping spring contacts in the socket, these can become corroded in hostile environments which causes a high resistance and localised heating. As the springs heat they lose temper which worsens the state of affairs increasing the heating which manifests itself in the plug. In any case both the plug and socket should be changed as both present a fire risk which may ignite before a 13A fuse blows, as well as personal hazard. Whilst I recognise that BS1361 permits a maximum rating for a socket outlet of 13A I personally wouldn't want to use a device at that current for a prolonged period. In all electrical matters assume it's dangerous and make your own safety the highest priority. Regards Martin
  8. A long time ago, autumn 1972 aged 18, I joined the LMR S&T dept. My second day on the railway involved going to Watford Junc with a senior colleague to look at the two control trains stored in the carriage shed, adjacent to the St Albans branch. They were I think formed as 3 car sets, but of what stock I have no idea. To my untutored eye the equipment looked way beyond use and I do agree with an earlier poster, that the visit was likely to see if anything was worth recovering for re-use. The most striking memory though was of the carriage shed foreman, old enough to be my grandfather, addressing me as sir. Happy days. Regards Martin
  9. Was it really 1976 Stationmaster, hardly seems like yesterday. There was I think a general pay review of salaried staff at that time, which generally meant that everyone went up a grade. At that time I wasn't on the top rate for STOs so I stayed as I was. As a result all my colleagues who had been STOs became MS1s and lost out significantly, not only that as well as my own overtime I picked up the odd hours they didn't want cos they weren't going to work for nothing, I was taking home at least as much as my MS2 boss. Martin
  10. I'm a bit late to this thread, but interesting nonetheless as I grew up in Orpington. I have a BR-SR locomotive route availability dated 1-12-62. Regarding the Tonbridge to Bopeep Jn line, the following classes were barred, N (allowed between Tonbridge and Grove Jn), U, W, E2, E6, K, G16, H16, MN, N15, O2, S15, V 8w tenders, WC original and rebuilt, Z, All Diesel Electric locos except narrow body Cromptons, All Diesel Hydraulic locos,BR Stds Cl4 4-6-0 and bigger, most of the smaller ones had major restrictions, all LM region locos, B1, WD 2-8-0. Actually it would have been quicker ti list what was allowed. Regards Martin
  11. Kevin Yeadon Vol 38 has a good photo of 1882, probably at Stratford, but certainly London. The engine went to Stratford on 12th Jan 1939. Regards Martin
  12. Simon As a former S&T bod the answer is that the signal engineer would do absolutely nothing other than say your siding is too short. In the real world any vehicle that coudn't be parked with adequate sighting of the signal would be banned from using it. Unfortunately there is no realistic getout, don't seem to be any traps either. Regards Martin
  13. Hi St Enodoc You and I probably know each other, I was often signalman at Sheffield Park at that time. I remember well bell codes 5-2, release staff for shunting, and 2-5 shunt withdrawn. This was I feel prior to the installation of the outer home and advance started at SP. No doubt If I ploughed through BNews for the time I could date the events. The pull off down the Newick spur was to retain some semblance of a timetable on summer sundays because you couldn't round via the single line. It was a long time ago. Regards Martin
  14. Jim It's Stirling Middle, I haven't been there for a while so the current position is probably a bit different., there has been some rationalisation. The distant under SM47 is for Stirling North. The three way bracket is as you surmise correctly, The off arm at one time had a distant arm for Stirling South, long gone, although I agree if you don't know the layout the capacity to confuse is great Regards Martin
  15. Hi adanapress The two signals are the result of the lines from Perth to Stanley Jn being bi-directional. How long this has been in operation I'm not certain, but theres no mention of it in the 1977 sectional appendix so reasonably it post dates then. Regards Martin
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