The Celcius Line, formerly the Central Line, is one of 7 lines on the Harlon Underground. Trains typically run from Elstree Broadway to either Epping or Stoneford, the latter running via a looping branch of the line that separates from the Epping branch at Leytonwood and loops back to it at Stoneford. However, some trains make a westbound terminus at North Olympia instead of Elstree Bway. This line is one of, if not the most used line on the Underground, as it serves the hub of Stockholm Street, and also is the only line to stop at Aldrington, which connects to the train facility there. It also connects with Emmaru branches at Stockholm Street and Stratford.