The South Blix Underground is a rapid transit system in the city of South Blix. A symbol of the city, it is noted for its density within the city limits and its architecture. It is entirely underground and 3014 kilometres long. It has over 5303 stations, of which 362 have transfers between lines. There are 924 lines, which are identified on maps by number/letter and colour, and direction of travel is indicated by the terminus. The SBU offers service 24 hours a day, seven days a week for every day of the year. The SBU previously served the entire UBA, however in July 2016 the system was divided into SBU and UBU (Urban Blix Underground), both systems are owned by the national corporation People's Transit, which owns all public transit systems in the PDRD.
The SBU is the busiest metro system in the world with over 100 million daily users (plus an additional 100 million users of the UBU).
Lines B-Z are major lines which cross the entire island or UBA. The busiest line in the system is the C-line (nicknamed the Marci Line), which serves West Blix to Sengkeng to Marci Square to The Lorx to Easttip.
Lines Ax are South Blix Aboveground lines. (e.g. Ab, A42, Aq)
Lines 1-250 are lines passing through Marci Square.
Lines 301-371 are lines which pass through Beckerham *but not* Marci Square.
Lines 401-451 are lines which pass through Bankshire *but not* Marci Square or Beckerham.
Lines 501-659 are lines which *do not* cross the WEST LINE. The WEST LINE is the border between the borough of West and the City-Centre quarter of the Island.
Lines 701-749 are lines which pass through the City-Centre but not through Marci Square, Beckerham, or Bankshire.
Lines 801-1100 are lines which *do not* leave the Eastern half of the Island.
Line 1200 connects Scorch Island to the A line.
Lines 1201-1299 are lines on Scorch Island
Lines 1401-1599 are lines on islands besides South Blix Island, Scorch Island, and West Blix Island.
Lines 2001-9000 are lines in the UBA, but not South Blix
Note: the XXX pattern will follow the rules above.
Lines structured as 2-XXXX pass through West Blix and South Blix.
Lines structured as 3-XXXX or 4-XXXX cross from another UBA city to South Blix.
Lines structured as 5-XXXX or 6-XXXX exist solely in the UBA with or without connections to Jala or West Blix.
Lines structured as 7-XXXX connect through Jala (may also connect another UBA city).
|1||Bankshire to Marci Square|
|7-5-2-311||Jala to East Blix to West Blix to Beckerham|
|5-3010||Iconic Liverpool to al-Mansura|
|B||Old Iconic to East Blix to Marci Square to Beckerham|
|7-6-891||Jala to Ferry Hills to Easttip|