You have simply used electrified=4th_rail here but the electrical system is different from pure Underground lines.

Are you sure they have gone permanently?

You have edited ways in Australia as well as the UK. Did you mean to do that?

Why?

You have followed Esri imagery, which is poorly aligned in southwest London.

Or should it have been amenity=grass?

Did you mean grass=amenity?

See also @Jason_Brown/diary/392740

Did you mean to put grass inside water?

Who asked for this change?

Welcome to OSM and keep up the good work.

What was wrong with it?

Being created with an editor that added foot=yes automatically in a preset is itself understanding why, especially when new editors were involved. I clicked through that preset in my early days and I am sure many others did too. It was wholly orthogonal to any process of tagging ways foot=designated.

When paths tagged highway=footway foot=yes were created with Potlatch 1, the tag foot=yes is likely to have come from an editor preset and is much less valuable.

Hi, I am looking into possible bugs in the iD editor. I notice that the tags on the ways you edited changed to building=yes or building=no. Was that a change you made deliberately?

Welcome to OpenStreetMap. Please don’t change names to block capitals; each renderer chooses how to display them.

Has the building actually been demolished?

Did you mean to delete node/5971433286/history ?

Without having gone back yet, you are probably right.

Have the roads you deleted actually been closed?