Sliding gates often fail to open or close because debris blocks the track, wheels slip off the rail

https://jaidenpraf721.cavandoragh.org/why-iron-gates-sag-and-how-welding-can-reinforce-cracked-or-weak-sections-1

Sliding gates often fail to open or close because debris blocks the track, wheels slip off the rail, tracks shift out of line, or the operator needs a reset after an obstruction is cleared.