In 1932, after five years, a new city line was introduced for the first time. Until then only line 4 from the town hall to Ruprechtice had operated. On 15 May line no. 5 (Radnice - Harcov) was also introduced, and right afterwards, on 10 June, line no. 6 (Radnice - Janův Důl kostel). Until the completion of the tram link between the viaduct and the railway station, the line ran via Soukenné náměstí and the station, and afterwards directly along Františkovská street. In 1933, during the difficult situation of the harshly impacting global economic crisis, however, a radical curtailment of operation began. Neither line 5 nor line 6 was profitable, so they were first merged into one. Even that did not help, and so on 11 September it was decided to discontinue their operation. In the following years bus operation was provided exclusively by private operators.
Bus lines reappeared in the city's hands only in 1939. From the beginning of 1940 the number 6 was given to a circular line from the town hall to Pavlovice, Stráž nad Nisou and back via Růžodol I. The changes after the end of the Second World War eventually led to lines being marked with letters, which definitively ended the era of bus line 6. The line to Pavlovice continued under the designation C, and line B ran to Stráž. Since then no line has borne the designation 6.
Contributors: Boveraclub (historical records), Liberecká podniková (videos, proofreading), Tomáš Krupička Sr. (local facts) and others.
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