Looking good.

Do make sure to tag a service on the secondary rail tracks though. It's extra helpful because these yards are a specialist thing and not all maps will want to show them. (Not meaning to discourage you, quite the opposite!) :)

Good work anyhow.

Yes, JOSM has an interesting habit of connecting up unrelated bits. You can go into the settings and make it so that it won't draw a line between points that are further apart than, say, 50 metres, and that will usually fix that. :)

I don't think there is a specific tag for ambulance stations. It's not as major a waypoint as a hospital or doctor's surgery, so I guess it makes sense. If nobody else knows I guess we can make one up I guess, but it's probably not a major issue. :)

In the past I've merely noted their address information and tagged them as a normal house node with the Karlsruhe Schema, so while it doesn't render on the map, it's still searchable by address if anyone needs to find it. :)

There's a link in the bottom right hand corner.