Survey Korean name of railway stations in Korean OSM Community.

![Seoul Subway, building sign of sangbong station (c) hyolee2] (https://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Korail_Sangbong_Station.J...

Update main and branch railways of South Korea

I found broken railway tags in South Korea at OpenRailwayMap. For three weeks, I updated railway routes of main and branch lines in South Korea. It...