Are these the buildings:

node/5264267029/history (Ebury Square)
way/391413814 (Francis Holland school)

The Ebury Square building node needs duplicating ungluing and correcting, thanks for spotting that. The back angle of the building should be visible from the car park on top of the tracks accessed from the corner of Eaton Terrace/Ebury Street.

Mapping of the London Underground started from a time long before overhead imagery, so ideally best to try and visit the locations in-person:

https://vimeo.com/79432674

Think this changeset was fixing track spacing that had been edited to be impossibly narrow (eg. 1 metre between track centrelines)—the joining/spacing lines help prevent additional future damage.

Please consider if the spacing do any significant harm, and compare that to the clean-up costs. (eg. the disaster that has happened at St Pancras/Kings Cross from enthusiastic edits to the CTRL/HS1 trackage.

Once again, thanks for spotting this.

Please avoid just "smoothing" things. Standard back. Look at the shapes, work out the continuous radius curves. Look at the funnel shape of the bridge, and the "pinched" shape of the crossover as the parallel main lines come together, almost touching, and then dance away again.

FWIW, the junction of the CTRL Relief/CTRL Down should be somewhere level with the pond.

The Silo curve/ECML-NLL link junction is indeed much closer to the MML (it's on the bridge).

Try to ignore the highly-distorted imagery from Bing, and instead understand the underlaying geometry.

From an initial review:
Join of CTRL Relief with NLL link curve several meters above: node/5763221033
Unnaturally sharp curve introduced: way/108285818
Removal of second trackbed/passive provision alongside NNL link: way/108340020/history
Relocation of Silo curve/NNL link junction.
Relocation of CTRL relief/CTRL Down junction.
Reshaping of the scissors crossover: https://youtu.be/yuvnIS5SxDY?t=5m39s
Making the tracks over the ECML bridge parallel.

And another one.

@liam-2001: please could you explain what was this edit at St Pancras was trying to accomplish?

(It appears to have caused quite a bit of unintended damage).

Danke! Hoffentlich gefixt in:

changeset/61180981

Revert of changeset/60864458 by @Joker234 removing addition of "gauge=" and "voltage=" on nodes.

Hopefully partially reverted ("voltage=" and "gauge=" removed on the nodes) with:

changeset/60899375

Was there anything else in the changeset?

In Openstreetmap, we three object types {nodes, ways, relationships}. This changset (errornously) set:

every(node).tag["voltage"] = xxx

it *should* have done the following:

every(way).tags["voltage"] = xxx

This changelog probably needs reverting. It has marked every *node* on every *line* with "voltage=" and "gauge=" tags.

What has probably intended was to mark every *line* with with "voltage=" and "gauge=" tags.

Some parts partially restored in:

changeset/55889803

Changeset reverted in:

changeset/55889407

owing to quantity inaccurate data inserted.

Hello Highflyer74:

https://taginfo.openstreetmap.org/tags/building=yes

is used 200+ million times. The documentation states "building=yes Use this value where it is not possible to determine a more specific value. ", further detail on:

building=*

building=depot is used 500+ times:

https://taginfo.openstreetmap.org/tags/building=depot

building=farmhouse is used 200+ times:

https://taginfo.openstreetmap.org/tags/building=farmhouse

It would be great if somebody could do a further on-the-ground survey and refine some of the mapping.

It should have been in the changeset osm.wiki/Tag:'source=' (probably the changeset was not closed properly, so the source= was not saved as intended). Here:

https://www.youtube.com/watch?v=xf6rl2NuuEM
https://www.youtube.com/watch?v=PP5iFatyfbg
https://www.youtube.com/watch?v=fdNLaXAxeH8
https://www.youtube.com/watch?v=ufMuhOeR-F0
https://www.youtube.com/watch?v=fdNLaXAxeH8

Checkme, vandalism?

@tyr_asd, 456011450 has been tagged with an additional osm.wiki/Tag:'note='; and 464954580 has been deleted. Thank you for highlighting these. Imagery, photographs, GPS traces, surveys, measurements, and derived template lines all form a basis for cartography. Ever little helps, and any individual cartographer can only work from the selection they have before them. With OSM the aim is to share, to allow equal contribution by all.

@mapper999: Yes, definitely!

Having tried to map the very-wide "Garden Ring in Moscow" a few years ago, I too am looking forward to area:highway being deployed and working, and to being able to convert stuff.

(As of early-2017 highway:area is still marked as 'proposed', and not rendered by the default style sheets).

Danke!

This changeset has stopped the wide paved foot/cycleway from rendering.

@tyr_asd: why would I necessary be the person doing the next edit? The intent behind OSM is to enable access and equal ability-to-contribute by all.

Storing some work offline, but other work online creates an imbalance between contributors. A similiar situation can occur when GPS traces were used, but are not available: therefore OSM has a mechanism for uploading GPS traces, which can then be accessed by all, equally.