How to use "rails" in a sentence

A Vegas stage extravaganza could easily go off the rails

"We let the marriage go off the rails

He stared at her through the side rails of the bed.

He thrust it between two of the side rails, and he opened his small weak hand beseechingly, reaching for love, trying desperately to touch her.

Danny became excited when he saw her drawing near, and in spite of his terrible condition, he shakily thrust himself into a sitting position, clutching at the bed rails with one frail, trembling hand, eagerly extending his other hand toward her.

He just went right off the rails," Dombey said, obviously embarrassed that one of his colleagues would lose control of himself under those circumstances