Civil engineering machine

A civil engineering machine, comprising

• an undercarriage which comprises a chassis,
• a superstructure with an operator's cab, the superstructure being mounted on the undercarriage, so as to be rotatable about a vertical axis of rotation,
• a leader with a linear guide along which a work carriage with a construction work implement is displaceably mounted, and
• an articulation mechanism by means of which the leader is adjustably mounted on the superstructure,
• wherein
• the articulation mechanism comprises a telescopic arm having a horizontal pivot axis on one end and a free end on the other end, the horizontal pivot axis being located above the operator's cab, and a holding device arranged at the free end of the telescopic arm so as to be pivotable around the telescopic arm and configured to hold the leader such that the leader is pivotable between a vertical position and a horizontal position, the leader being held only by the holding device,
• a distance of the leader relative to the superstructure is adjustable by extending or retracting telescoping of the telescopic arm when the telescopic arm is substantially horizontally oriented, without substantial changes to the vertical position of the leader,
• the undercarriage is configured as a track-bounded undercarriage with a chassis having wheels for driving on railroad tracks, and
• in a transport position for traveling on the railroad tracks, the telescopic arm is oriented substantially horizontally above the operator's cab and is extended axially and the holding device places the leader in a lying position in front of the undercarriage.