I read an old British book a while back and saw mention of a "device" used (apparently against company regulations) to increase a steam locomotive exhaust blast and draft somehow. I've never seen the ad or a picture of it, but the manufacturer claimed the device could be "removed in ten seconds", suggesting the engineer could hide the thing if the engine inspector was about.
What would this device have been? A clamp-on nozzle or extension to increase the exhaust blast force and draw a harder draft on the firebox? The story goes such devices were popular among some engineers, when the drivers with the best times (all unofficial they say) were pop culture heroes of the time. Here's one proud gentleman: http://tinyurl.com/h2vpuby
