Andy wants a job as a signalman on the railways. He is told to meet the inspector at the signal box. The inspector puts this question to him: ""What would you do if you realised that two trains were heading for each other on the same track?"" Andy says ""I would switch the points for one of the trains."" ""What if the lever broke?"" asked the inspector. ""Then I'd dash down out of the signal box"" said Andy ""and I'd use the manual lever over there."" ""What if that had been struck by lightnin…