Steve,
You're welcome! I've actually been spending some time over the last few weeks to work out when I can next get a trip to Didcot with a camera and tape measure...
Steph
Dad,
I've just re-read Kevin Robertson's book and it's certainly true for one of the gas turbines. In fact it seems to have been something of an ongoing problem with people regularly complaining of being covered in soot. Even the GWR's own chiefs were concerned about their effects on infrastructure (smoke deflectors on bridges, signalling equipment, that sort of thing). One detail Steve needs to consider in his operation of Ranelagh Bridge is that 18000 ran to/from Paddington using it's auxiliary diesel engine and was shut down/started in the platforms. That must have been an amazing spectacle.
Mind you I guess the concerns of the management were probably nothing to the permanent way guys if they happened to be working in a tunnel when 18000 went through; apparently the fumes caused a certain 'effect' in less robust individuals...
Steph