Stockholm's metro has attracted a lot of attention since its makeover. And this is not because of its speed or technical innovation, but rather it's creative capacity and innovation. The first art installation appeared in 1957 and the trend has started ever since. Beneath the Swedish capital, the 'world's longest art gallery' means that 90 out of the 100 stations along the 110km of tunnelling are adorned with paintings, installations, mosaics and sculptures by 150 artists since the 1950s. It captures the European cultural boom which expresses a combination of political upheaval and postmodern uncertainty. This art initiative began after many believed that art had to be accessible to the wider community and could even reduce crime.
Last week's video of the week: What can we expect from Riyadh's metro in 2018?
Don't miss your opportunity to attend this year's SmartRail Europe conference! There will be a range of metro and rail operators from across the continent looking to build the digital railway of the future. Look at the agenda here.
Here are some other impressive metro stories gathered from around the world: