Update README.md

README.md

 # FACT Rail Stations and Lines
+
 Rail stations (passengers and freigth) and working rail lines in Europe and North America from OSM.
+
 ---
 ## Use
 Connect to the GitLab container registry with privileges for the FACT group:
@@ -21,15 +23,22 @@ The container makes available a MariaDB instance with the full database on the r
 ```
 Table           |Size (MB)|Rows (#)|
 ----------------+---------+--------+
-eu_lines        |   777.56| 1167075|
-eu_stations     |     0.02|       0|
+eu_lines        |   777.08| 1172918|
+eu_stations     |    14.98|   30049|
 geometry_columns|     0.02|       4|
-na_lines        |   230.80|  446942|
-na_stations     |     0.02|       0|
+na_lines        |   231.65|  449237|
+na_stations     |     1.13|    3734|
 spatial_ref_sys |     0.02|       0|
 ```
+
+![tables schema](FACT_rail.png "Tables in DB")
+
 ---
 ## Notes
+OSM maps for Europe and North America are downloaded form https://download.geofabrik.de/
+
+Tag filtering is used to select rail lines and stations, and then data is transformed to .geojson and uploaded in the database server.
+To manipulate and transform data, we use https://osmcode.org/osmium-tool/
 
 ---
 ### Authors