[Duj the not-so-stupid] So what is the real purpose of a sand box?

[Chalky] 'Morning.
The 'sand box', and I'm sure that Rosie and others can explain it better than I, is a box full of sand or grit of some kind or other. In olden days steam engines used the contents of such, as and when necessary, to increase the friction between wheels and rails. This was effected by dribbling the contents of the sand box onto the rails in front or over the driving wheels. Naturally (and obviously) you are far too young to have seen or heard this highly technological process in action.

I'll tell you the real purpose later. As a clue: Have you ever owned a cat?

(Dujon) Ah! Things are now clearer because I didn't know you drove a steam engine. Even I don't do that. Sand is useful and may have prevented this, the slip to end all slips. Click on the bottom recording, marked "60532". The quality is rather poor. The loco slips a bit on starting (quite usual) but the mayhem begins after 1m 50s. After another 15 seconds or so you can hear the water being carried over to the cylinders, which caused the real damage. All 3 connecting rods and the coupling rods and valve gear were bent so that was the end of that little day out. Why didn't the driver just shut off steam? He couldn't. The big handle wouldn't move against the huge volume of steam and water going through the main valve. He had about one second and missed it. No more driving for him, at least of that loco, which cost £80,000 to repair.

At the risk of seeming insensitive given pen's recent difficulties, I've finally been offered a permanent position at Edinburgh Uni. Woo!

A bit of a long and torturous story this one... back in July, I was offered a similar position in Manchester, but there were various reasons why we didn't want to move back then - not least the fact that we'd bought a flat in Edinburgh exactly one week previously. Turning that offer down was one of the trickiest decisions I'd ever made. Anyway, the gamble paid off in the end, and I'm now very relieved and pleased.