Updated README

README.md

@@ -18,6 +18,7 @@ This file describes all NMBS/SNCB stations in Belgium. A station can have multip
  * `alternative-nl`: alt. name in Dutch, if available
  * `alternative-de`: alt. name in German, if available
  * `alternative-en`: alt. name in English, if available
+ * `telegraph-code`: abbreviated name for Belgian stations, used by NMBS/SNCB internally. Source: [Infrabel Network Statement](https://infrabel.be/en/networkstatement), [attachment D](https://infrabel.be/sites/default/files/generated/files/paragraph/NV_BijlagenD_RIEI_26.zip) file _D06-RIEI-12_N_20230915.pdf_.
  * `country-code`: the code of the country the station belongs to
  * `avg_stop_times`: the average number of vehicles stopping each day in this station (_computed field_)
  * `official_transfer_time`: the time needed for an average person to make a transfer in this station, according to official sources (NMBS/SNCB) (_computed field_)

stations.csv

@@ -687,6 +687,6 @@ http://irail.be/stations/NMBS/008892635,Zingem,,,,,FZG,be,3.646384,50.908025,37.
 http://irail.be/stations/NMBS/008832250,Zolder,,,,,MZD,be,5.3299,51.033548,30.571429,300
 http://irail.be/stations/NMBS/008832334,Zonhoven,,,,,LZH,be,5.348815,50.989557,30.571429,300
 http://irail.be/stations/NMBS/008895208,Zottegem,,,,,FZT,be,3.81441,50.869102,184.845714,240
-http://irail.be/stations/NMBS/008891611,Zwankendamme,,,,,,be,3.191557,51.306409,0,
+http://irail.be/stations/NMBS/008891611,Zwankendamme,,,,,ZWA,be,3.191557,51.306409,0,
 http://irail.be/stations/NMBS/008894821,Zwijndrecht,,,,,LZD,be,4.32978,51.214108,140.131429,300
 http://irail.be/stations/NMBS/000000252,Zwijndrecht-Dorp,,,,,,be,4.32567070,51.2191653,1.588571,120