Cycling road itself, like can be equipped with railroad tracks, so the ups and downs in the run are easy. In disused course, you can go as if you were a train passing the station buildings, platform and signals, through a tunnel looking closely.
Firefly can be a symbol of clear water. Only in the clean water streams the larvae of fireflies can mature. Beyond the ecological discourse, fireflies seem to have become a means of regenerating the past or propaganda against some kind of development.