Bulgarian State Railways (also known as BDZ) is Bulgaria's main railway operator. The company operates three principal types of train:
- Expresen Vlak - express services which require seat reservations;
- Barz Vlak - fast trains, no reservation required; and
- Patnicheski - slow trains, no reservation required.
Reservations (or zapazeno mysasto in Bulgarian) cost around €0.25 (although this fee may vary depending on point of purchase). The company also operates a number of international services. Reservations are recommended for these more popular routes.
The company has ticket offices at many of the country's main stations, including Sofia Central Station.