Single MetroTram/MetroBus lines operate on the main radial network. As a rule, the line number corresponds to that of 1993: the M4 from lines 2, 3 and 4, the M5 from line 5, and so on. In addition, the two Pankow lines 52 and 53 were included as line M1 in the scheme. The supplementary lines of these radials continue to be numbered from 10-19, unless they augment the respective metro service. Metro services of the ring and tangential net received a number in the range 10-19; the supplementary lines retained a number in the range 20-29. An exception is the subsequently established line 37, which, together with the lines M17 and 27, travels a common route. Of the lines numbered 50-59 the only one remaining was the 50; the lines numbered 60-69 remained largely unaffected by the measures.