Sentence examples for trained being from inspiring English sources

One report from Jhpiego found high marks from guardians themselves who were trained, being appreciative of the information given regarding infection prevention [ 10].

And what "training" was there?

Driverless trains are commonplace.

Trains were inoperable.

"That train is dead".

The train was quiet.

Lax training was cited.

And training is essential.

The training was free.

Training is absolutely essential.

What train was it?