From The Pop-Up City:

It’s officially called a ‘transfer accelerator’ by Dutch railway maintenance company ProRail, but everyone else would say it’s a slide. An awesome slide. Installed next to a stairway at the newly renovated railway station Overvecht in the city of Utrecht, the slide offers travellers the opportunity to quickly reach the railway tracks when they’re in a hurry. But above all, the slide is a great instrument to make the city more playful. The ‘transfer accelerator’ was designed by Utrecht-based firm HIK Ontwerpers, and installed as the final piece of the renovation of the Overvecht railway station.