The inspector decides to give Santa a pop quiz, asking: `What would you do if you realized that two trains were heading towards each other on the same track?`

Santa says: `I would switch one train to another track.`

`What if the lever broke?` asks the inspector.

`Then I`d run down to the tracks and use the manual lever down there`, answers Santa.

`What if that had been struck by lightning?` challenges the inspector.

`Then,` Santa continued, `I`d run back up here and use the phone to call the next signal box.`

`What if the phone was busy?`

`In that case,` Santa argued, `I`d run to the street level and use the public phone near the station`.

`What if that had been vandalized?`

`Oh well,` said Santa, `in that case I would run into town and get my Uncle Bhalla`.

This puzzled the inspector, so he asked, `Why would you do that?`

`Because he`s never seen a train accident.`