FGW operates a sleeper service between London and Penzance. It also operates a sleeper service between Penzance and London. At some point the trains must “cross over”, a very exciting moment, regardless of trains, tracks or terminus. My aim is to catch the crossover of the two sleepers. On video. And then post it to YouTube. But… Where should I go? The only way to deal with this is to use the well known programming technique called the Deltic Chop. So, I’m off to Bristol tonight for a stab at what could, quite honestly, be a unique capture. A moment of railway history.