What a nonsense. Whoever made this one up? Do you really think that airline pilots, who maintain a constant discussion with one another, plus listening for vital instructions on a common radio frequency full of static and irrelevant messages to others, but periodically very relevant to themselves, are in any way less capable of performing their task because of all this going on?
But an airline pilot is being constantly told what to do through listening, and the constant discussion is because it would be very difficult to control a big jet at a vital time such as landing and take off on your own. Remember when they reach cruising altitude, there is little to do but scan the instruments, and there are stories of pilots having a nap in the cockpit, and even pilots waking up to find their co-pilot asleep
Driving a train is, as I see it (preparing for torrent of abuse if I'm wrong), more or less a one person job in each role (driver/guard etc), and their instructions are being given more visually than audibly. But still I completely agree that with any distraction, within reason, a driver or guard should be able to carry out their duties safely.
Back on toots of the horn, when I've been filming at Norwich a few years back, I got three toots and a thumbs up from the driver of a Class 90 as he left for London, and a toot from a 66 hauled container train at Rugby, which made me jump out of my skin
