Driven to write offers one of two items today. The first one is a little puzzle.
The second item comes along a little later, just as soon as I have invested two weeks of research into the matter.
For the first item I must ask you to take a look at the rather grey and miserable image of these cars. They all have something distinctive in common (over and above being rather tediously coated). If all goes well one of DTW’s eagle-eyeballed readers will have worked it out by breakfast time.