Even though this piece is right next to a train station, the title 'enjoy the journey' refers to life rather then a train ride. Everybody is equal in the sense that their life will end at some point, so you might as well enjoy it, according to the artist. The skulls spiral into the disappearing point, symbolizing death.

As an added bonus, you can download the free smartphone GIF-ITI viewer app, to turn the artwork into a moving sensation using the power of augmented reality.
https://www.gif-iti.com/gif-iti-viewer-app

This artwork can be a bit hard to find, as it is on the back of the building towards the train station. One of the best ways to view it, is from the platform of the train station. To enter the platform you need to check in, but you can get up to the platform for free without having to check in. Just climb the stairs of the train station and go down to the first platform.