AnimaSinistra
Governor
This is a beautiful example of a so called "gauntlet track" or 'interlaced track". It is part of a double track line that is locally narrowed, e.g. for crossing bridges or tunnels, costly to build, in order to keep them smaller in width. In one direction, the train uses the first and third rail, in the other one the second and the fourth. The tracks generally interlace by means of a frog gauntlet, i.e. the inner rails of both tracks simply cross, saving the cost and maintenance of a switch on each side of the narrowing.
Of course, only one train can pass at the same time over the gauntlet track, and opposing traffic has to be controlled by signalling.
For this gauntlet track, train drivers got the instruction "If there is a chick on the track, you can proceed at line speed!"
As a rail fan, thank you for the explanations!