Given over head power cables for trains, trams and trolley busses are under constant tension and must experience a fair amount of vibration when in use:
- do they fatigue,
- if so, how fast,
- has anyone ever had to re-hang/-string them (why haven't I/we seen it happen)
- and are there any reports of fatigue breakage before the maintenance schedule catches the problem?
...and, yes, I should be out riding my bicycle.