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Thank you Roger, obviously I have an answer, a little query out there. You know the sound train makes, always used to make, de-tum, de-tum, de-tum. That was because the wheels, the bogies, were hitting gaps. Those gaps were left there deliberately to allow the rails to expand. More modern rails expanded more slowly, so you could put longer lengths of rails together. So because you don't have the gaps. While you were talking, a train went back to my house. And there it was, and I was hoping it would still be audible.