Some years ago, I was catching a train at midnight and there was a chap there who had clearly been at it since way back in the days of steam. He had notebooks, cameras, etc, and a clear idea of what was about to pass through the six-platform station, positioning himself exactly in the best place for each one. On one occasion, he went right down to one end of the platform I was waiting on and a ballast train trundled through at about 5mph a few minutes later. He walked slowly along side it, talking into what I presumed to be a mobile phone, but as he passed me it became clear that it was a dictaphone and he was dictating the wagon numbers into it, in order to write them down properly later on....