why

[jim currie]

why is it that trains run well till someone comes to see the trains run then everything that can go wrong happens loke derailments uncoupling at odd spots or a main line switch machine burns out?

[TMo]

I am sorry to say that you are not the only member of the Fickle Finger of Fate Club ....  It really never fails.  Even if you've been running the same train through the same set of switches all day, the moment someone comes down to see your work, derailment.