Railway abbreviations have the following meaning

Railway Country Name of railway
AT&SF USA Atkinson, Topeka & Santa Fe RR
Amtrak USA American Passenger Railway Corporation
BN USA Burlington Northern
CFL Luxembourg Chemin de Fer Luxembourgois
Railway of Luxembourg
CSD Czechoslovakia State Railway of Czechoslovakia
DB Germany Deutsche Bundesbahn/Deutsche Bahn AG
DSB Denmark Danske Staatsbaner
Danish State Railways
FS Italy Ferrovia dello Stato
Italian State Railways
NS Netherlands Nederlandse Spoorwegen
Railway of the Netherlands
MAV Hungary State Railway of Hungary
ÖBB Austria Österreichische Bundesbahnen
Austrian Federal Railways
RhB Switzerland Rhätische Bahn, Swiss private railway
SBB Switzerland Schweizer Bundesbahnen
Swiss Federal Railways
SF USA Santa Fe RR
SJ Sweden Sveriges Jernvegen
Swedish Railways
SNCF France Societé Nationale de Chemin de Fer
National French Railway Company
SNCB Belgium Societé Nationale de Chemin de Fer Belgique
National Belgian Railway Company
SP USA Southern Pacific RR
SZD Soviet Union Sovjetskaya Zhelesnaya Doroga
Soviet Railways
Thalys Europe Joint high-speed (TGV) service of the Belgian, Dutch, French, and German railways.
UP USA Union Pacific RR
WP USA Western Pacific RR