At the time this cycle park was built, it had 4150 cycle spaces, bringing the total for the railway station to a bit over 6000. It was later found to be inadequate, and total capacity at the railway station was expanded to around 10000 bikes. See the blog for more details.
This bike park cost €10M to build. Groningen is the world's top cycling city. Around 60% of all journeys in Groningen are by bicycle.