Driver protection cabin of a public passenger transport vehicle

Driver protection cabin (10) of a public transport vehicle, such as a bus, wherein the driver protection cabin (10) has at least one wall (15) on the side facing the entrance of the vehicle, wherein at least one protective pane (20) is arranged displaceably parallel to the wall (15) on the wall (15) by at least one telescopic extension (21, 23), wherein the at least one telescopic extension (21, 23) has a locking device (27) for fixing the protective pane (20) in different positions relative to the wall (15), wherein the locking device (27) comprises at least two racks (29, 30) that can be brought into engagement with one another.