What exactly is that smell?

[RobertInOntario]

Rob beat me to it, but yes, I remember that smell very well too. It is indeed Ozone 'created' due to the arcing of the motor brushes.
So, the solution to the hole in the ozone layer is to collectively run all our trains non stop, and the amount of ozone produced should sort it out, if not, hey we're having fun playing with trains!

Koos

Thanks. FYI, My Hornby Dublo locos are the main ones that make this smell! Rob