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34theletterbetweenB&D

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34theletterbetweenB&D last won the day on December 20 2011

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  1. This is the term for all mechanisms causing reduction in electrical conductivity, not solely resistance, but also other effects such as inductance. Yes, for any given cross section of the same straight wire, due to simple resistance which will increase in direct proportion to length. But if the short wire were wound around an iron core, the inductance this would cause with any variation in voltage - the common example being AC - then it might well have greater impedance than a longer piece of the same wire. There's more, much more, if you want to know here's a 'starter for ten' (though questions based on this are rare even on University Challenge nowadays...) https://en.wikipedia.org/wiki/Electromagnetism
  2. Wide open target there, integrates perfectly with a range shortly to include EE type 5, Brush 2, BR block enders. Go on, make my kit builds redundant...
  3. Doesn't everyone simply turn their latpop on its side, handy devices with a screen settable at right angles to the keyboard. How I loved my first potlap for this capability when the internet was young and there wasn't the s/w to spin scans of 'the problem' around...
  4. Now this is a separate subject of which I have no direct railcleaning experience. (Even in my wilder moments I cannot justify multigauge on the ECML, simply for the joy of having a sway.) But I am given to believe by a friend who has a multigauge system, that this is best tackled with a solvent applicator cleaning wagon. Which might not be the answer requested...
  5. When I had a chat with the train manager in November last, while on Eurostar heading to Amsterdam, extension to German and Swiss principal commercial centres were mentioned as particular targets for business traffic, infrastructure work underway to that end. All too late for me other than occasional leisure trips: how much I wanted to use Eurostar to access Benelux, Germany, Denmark, Switzerland , but the scheduling was hopeless, no 4 am departures from London, so no prospect of in and out in a day, flying was the only possibility. (A colleague that thought otherwise died on Herald of Free Enterprise...)
  6. That's why I run a cleaning drag moved by two centre motor both bogies driven weighted 'mules' to do the work: no sense, no feeling. Minimising the root causes of track dirt is well worth pursuing: all metal wheels, bronze or harder, all metal rails with no plastic crossings, no solder on rail head, minimal lubrication on stock. And the more running the rails get, the cleaner they stay. Nickel silver rail loses copper as copper oxide which is the doiminant inorganic component of the 'dirt' on the railhead. Once the rail head is well depleted of copper it not only stays much cleaner, but traction also improves.
  7. Dependent on the positional planning of the isolating section's rail gaps, slight pain to reorganise on a completed layout. Any chance of swapping bogies among your carriages so that those carriages that cause troble can have the insulated bogies? I am happily redistributing bogies from the new Thompsons, and will do the same with the new mk1s, positioning the bogies with pick up in brakes, for train in section detection.
  8. The textured back surface of older hardboard takes off the black muck very effectively, I use nothing else. Pretty easy to come by in the UK, mine is salvaged from the back panels of cheap flatpack furniture installed sometime around 1974 or later (based on the date of newspaper stuck to the floor with paint). Used by hand, stick a woodblock on the back of small pieces, or as a weighted drag behind a loco with good traction. Clean the much off with a fine wire brush, you can get weeks of use from a piece.
  9. It'll be pseudo-random! Try the loco with the rods removed. If the kick still occurs then it's probably a defect on the idler gear (likely acting on the left side of the axle gear to lift the right side wheel). If the kick is eliminated with the rods off then I am all out of ideas... A simple coupling rod induced problem (ditto such as wiper on wheelback, momentary fouling of rotating part on fixed structure) has to be at regular intervals.
  10. It will work for some, but not for me! Back in 2002 when I first became aware of the problem while trialling DCC, that was the first 'quick cheap and dirty' solution attempted. Totally worn through after circa 12,000 wheelpasses: which for my timetable operation of full size trains occurs after a few days... Live crossing is the only way for reliability in intensive operation using DCC.
  11. Possibly purchased damaged s/h and repaired? Had a couple of s/h Bachmann models with the pin for the drawbar on the adjustable tender slide broken off - clearly this advanced tech is too much for Johnny Ninethumbs - and have fixed this little problem in like manner. Wiring, when some knowlessman (thanks TP) has fiddled with the wiring, it's best not to bother 'working it out', just replace correctly wired. Personally I would ignore the tender completely leaving it isolated, and just wire from the loco pick-ups to the motor (with a decoder inbetween in the loco if required) so mcuh more convenient having a loco independent of the tender. Future notice for the youngsters among us: at some point in the next 30 years all my extensively modified stuff will appear s/h for you to figure out...
  12. That's the first meaningful use of a Venn diagram I have ever seen. And he's done loads: https://www.stephenwildish.co.uk/venns
  13. Probably the mechanism will be overheight to fit inside the body, but the nearest item in UK N narrow body mechs would be the class 20. Prototype had 24' bogie centres, 8'6 wheelbase bogies, 3'7" wheel diameter The more obvious centre cab class 17 is significantly longer at 28' bogie centres, but should be a good fit for height, has a slightly smaller wheel diameter too. Usual caution that interpretations in RTR model form may not fully conform to scale...
  14. A good indicator is the difficulties of numerous nations with trade across their borders: of uncertificated 'substances' for those with narcotic based 'hobbies'; and of people with hopes of a home in locations where enough future income and free time may allow them to enjoy hobbies.
  15. And while we are chuntering on about Kadees, anyone else ever had a coupler head fracture? Just once, on a circa minimum 20 year old #5. I was surprised by the 'random uncouple', and yet more surprised by the failure to immediately couple up, and my jaw dropped when the missing part of the coupler jaw became obvious on inspection. Probably a once in a lifetime thing...
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