The ground truth disagrees with the ORR.

Can you please don't make any edits which do not correspond to the ground truth?

The Network Rail and Elizabeth line stations at Liverpool Street are clearly separate by any verifiable means on the ground, even in the Elizabeth line route diagrams and timetables. They are just treated as one for ticketing purposes.

https://community.openstreetmap.org/t/how-to-tag-spiral-staircases/127529/6

Self intersection of spiral staircases is not a problem (although I have to add the missing tags - I ran out of time when surveying the station)

My understanding of the road network is that MOS road is a fork from T7. The distance markers count consecutively from Ma On Shan Road upon leaving route 2, through the Ma On Shan Bypass and onto the Sai Sha Road. Similarly on the other end, Sai Sha Road into the town centre is a westbound fork from the T7 as well.

In terms of the road network, isn't the bypass the main one, and the MOS to Road a fork from it? Only consider using the current network without taking any history into consideration please.

Sorry, you have messed up the underground station. I see that you added nodes onto the underground structure which shouldn't be connected to the street.

Paths inside train stations shouldn't be tagged with access=destination

Such usage will prevent OpenTripPlanner to use it on a through journey after alighting the train at Derby as the station is not the destination, just a place to change trains.

I have just fixed the relations and added some mapped platforms, please check.

Hello, please don't blame me on it. The relation was wrong well before I surveyed the stations en route, including the placement of stops on the opposite direction, and such fixes couldn't be done locally.

Sorry I've just missed it

Anyway I have just retagged Stratford with linear ways and indoor=area

I will do it later with London Bridge but without linear ways (as it is impossible there) to see what it will happen.

I have just surveyed London Bridge as well and, given how the station looks like, it is impossible to map the National Rail ground level by anything but just slap two areas (paid and unpaid) into it.

I'm currently working with OpenTripPlanner with area handling enabled, with the aim that accurate and realistic information can be delivered to people how long it takes and how to access platforms for train services.

Even if a router doesn't support areas, it will still route along the edge of these areas.

Just did it

Possibly I may need to make Meridian Square a multipolygon and make the flowerbed an inner way.

Yes. I have merged it with the bigger pedestrian area as surveyed.

I have added indoor=yes

Are there better ways to do that without breaking routing?

Thanks. I'll check and fix soon.

I have reverted your revert.

Please refer to railway=platform_edge for proper mapping of complicated platforms in train stations.

The changeset on the route says "Restored "London Overground" network tagging for some overground lines. Although Overground is a sub-network within the National Rail network the most local network is Overground". In this case, shouldn't the network relation tagged network="National Rail" while the route relations tagged network="London Overground"?