Setting the area tag seems to be necessary when converting platforms just drawn as lines to areas. Without this they don't seem to be included in the same extracts that platforms drawn as polygons. Organic maps is just one consumer of these extracts that is improved by ensuring the area tag is set.

This is where the two pairs of lines round the north and south sides of the sidings are connected together. I couldn't find a name for it but it's still a junction.

I've changed it to amenity=beer_garden

amenity=*

specifically says

"Biergarten or beer garden is an open-air area where alcoholic beverages along with food is prepared and served. See also the description of the tags amenity=pub;bar;restaurant. A biergarten can commonly be found attached to a beer hall, pub, bar, or restaurant. In this case, you can use biergarten=yes additional to amenity=pub;bar;restaurant.

None of this really helps as the important thing about the Beer Garden is availabilit of alcoholic beverages, which the leisure=outdoor_seating
outdoor_seating=garden combination doesn't imply.

I propose the Biergaten tag be changed to encompass the English Beer Gardens instead.

What's the correct tag for a beer garden?

Not really - but there's always a nagging doubt I've forgotten something - area=yes tags when converting linea featurs to polygons were my last omissiion somebody picked up on...

I think I have the connections between lines correct but I expect the physical locations will need tweaking when some better photography is available. Platform 2 needs to become a shape rather than a line.

What is the correct tag for Common Lane?

Not sure what the jargon means, sorry. It's a railway station.

I'm not sure, sorry.

It was attached to node/4290859478 which I merged with 5784212748. I just copied the tags across.

The tag is actual railway:ref:DB.

Not sure - it was park of one of the nodes that I merged. The CRS is SHF.

Sorry got caught out by the bug so I missed the the area tag.