S-Tog

One of the most popular means of city transportation in Copenhagen, are so called "S-Tog" aka "S-Trains". The are well known as they are all red color. They start running outside Copenhagen and go all the way to the city. My guess is they're not called metro as they don't cover only metro area. Anyhow, most of the time they run on time. But there are occasions when they're delayed. The good part is - every stop has a monitor telling you when then next two are coming. The bad part is - that system runs on windows, and that can fail - as pictured below: