osm.wiki/Good_changeset_comments
would be really cool.

Who says this? I doubt it. "roller_coaster"="track" and "railway" should never be used together.

Hi PlaneMad,
relation/1439535 is way too complex for handy editing. Please undo your changeset!
Kind regards

Is this a substation?

Bon Giornio!
What about better changeset comments?

What a shame: This is global vandalism, unreverted since 2 years.