It appears these things are Bluetooth (sorry if it’s been mentioned a thousand times). I was searching for a Bluetooth device of mine the other day and up popped several similarly named things.
Hmm. I would have expected them to be not visible to non-paired Bluetooth devices in normal operation. Or is pairing 40-odd devices per coach considered too difficult? It should only be a one-off job, unless replacing one that's failed or fallen off.