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AndyID

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AndyID last won the day on July 15

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  1. Here you go "Looking at the etymology, the Oxford English Dictionary cites British newspapers using "train station" in 1845 and 1856. And in 1825 the engineer Thomas Tredgold published A Practical Treatise on Railroads and Carriages, while in 1837 the Civil Engineer and Architect's Journal wrote about a "rail-road station". Nowadays that term would definitely be considered an Americanism and yet it appears to have been in common usage in Britain - the OED has numerous other citations." https://www.bbc.co.uk/blogs/collegeofjournalism/entries/1cbca265-2424-320c-b03
  2. Clearly "railway station" is quite American. I present the opening line of Simon and Garfunkel's "Homeward Bound". (Admittedly I believe Paul Simon was in England when he wrote it )
  3. Many "Americanisms" actually originated in the UK, were adopted in the USA and re-exported back to the UK. Similarly with spelling. For example, "spelt" is wheat. It is not the past tense of "spelled" and "spelled" is the way I was taught to spell it in Scotland more than 60 years ago. "Spelt" is just sloppy spelling. Florida??? I dunno. Arizona was bad enough. North Idaho is much more like it. Two weeks ago we were dining outside. Today we had six inches of snow and the power went out
  4. So why do you call them bus stations then? Busses stop at bus stations, ergo.....
  5. Pay no attention to them. If it's an AVO is a real "keeper". (As opposed to "kipper", in which case Hercule would have said something was a bit fishy )
  6. No doubt due to the Corrie-Alice effect.
  7. As Hercule would say, "Ze plot thickens" More questions: Are all the power bogies nominally identical? (same gear ratios, same wheel diameters) Do any of them have traction tires? Can the power bogies be easily removed from the coach bodies for testing or is that a pain? Is your meter analogue or digital? (for measuring the current analog would be better - digital meters can have a slow reaction time) What happens if you "assist" each powered unit by pushing it to make it go a bit faster than it wants to (does the gearing tend to "bind up"?).
  8. Apart from potential problems at rail-joiners the resistivity of nickel-silver (which has no silver in it) is more than 16 times that of copper.
  9. Of course you could have one go pop next week but it is fairly unlikely (Not like a computer I had to maintain. Germanium transistors - every time it was switched on there was a very good chance it would blow another one.)
  10. Indeed, and you can expect a diode to work for 350 million hours before it conks-out.
  11. Hi John, Not in my experience. I've tried small motors with large ratio reduction gears and the results were not satisfactory - they were extremely noisy and gutless. I thought I could get a lot of torque from a small motor with a large gear ratio but unfortunately large ratio gears tend to be very inefficient and they waste a lot of the power produced from a small, high-revving motor. These days I go for the largest diameter motor that will fit to get as much torque as possible and the lowest ratio reduction gear to maintain efficiency. Cheers! Andy
  12. I'm not sure it's simply a matter of efficiency. Iron cored DC motors can be very efficient too and they work with high and low frequency feedback systems. Coreless motors were developed for applications that require rapid acceleration/deceleration and removing the inertia of a rotating iron core makes that possible. Due to the reduced inertia, with low frequency feedback when the power is removed to allow the system to sample the back EMF a coreless motor slows down significantly . When power is restored the motor immediately tries to accelerate back to the speed demanded by the v
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