The first was an express line from 2002 on the route Doubí sídliště - Sídliště Broumovská and back, with the stops Na Kačírku and Plátenická. Later the line already terminated at the Na Kačírku stop. One morning service ran towards ZŠ Broumovská and one afternoon service in the opposite direction. It was abolished on 1 February 2005.
From 1 June 2007 a school line 52 takes its place, already on today's route. The reason was the change of traffic organisation in the Králův Háj area, when line 21 began to run semi-circularly via the upper centre. The number of morning services fluctuates over time between two and four.
A driver does not come across line 52, currently with two services a day, very often. When it does happen, there is no problem with it. The route is simple, familiar from line 21, traffic in this direction tends to be calm, only the vehicle can get quite overcrowded with students. But that one stop is bearable. You can watch one such morning trip of students to school in the following footage. It was filmed in an Iveco Urbanway CNG #537 on one autumn morning.
Contributors: Boveraclub (historical records), Liberecká podniková (videos, proofreading), Tomáš Krupička Sr. (local facts) and others.
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