Minor railroad track alignment changes in 1892-1915 period
Add more specific sources, start date, end date for railroad tracks
Add railroad tracks around South San Francisco
Add separate train station point
Tag Frederiksberg train station with extended railway tags
Add points and chronology for the three different main train stations
Draw railway corridor (station) more closely around the buildings
Improve source for defensive works, add more specific start dates and end dates
Add GNIS school from OSM with details from external source
Adjust water to align with building