The other day travel news reported severe delays on the Piccadilly line.

Not in itself unusual.

However, the postscript revealed that the severe delays were due to a shortage of trains.

Where did they go?

Is someone scratching their head, muttering "I'm sure they were there last night"?

Maybe someone forgot to lock the train shed doors and they slipped away for an adventure of their own? Right now, they're chuffing along on the outer reaches of the Metropolitan line – gone for a day out in Amersham.

Maybe someone parked them all in the wrong siding and train drivers are meandering all over Cockfosters calling for their lost trains?… "Fenton!"

Maybe the fat controller said "park them at Harrow" and was misheard? Trains are right now queued up at Heathrow instead.

Anyone seen the trains?

I hope they're found before Monday.