Lyn (Denmark)

There aren’t specific Lyn trains, instead the name refers to a train SERVICE that is Denmark’s fastest - because it skips more stations than the slower IC services.

This particularly applies to journeys between Kobenhavn and Arhus - Lyn services typically call at 6 stations when travelling between these cities, while in contrast IC services typically make 15 stops.

The same types of specific train - the IC3s, are used for these Lyn services AND the slower IC services.
DSB had introduced new IC4 trains in 2008, but they proved to be unreliable and are now rarely used on Lyn services.

Reservations aren’t compulsory on Lyn services, so seats can be unavailable on the busiest trains, particularly in 2nd class, if you don't opt to add a reservation to your ticket booking.

They are particularly recommended for journeys from Fredericia and Odense to Kobenhavn - and if you will be joining a Lyn service at Kobenhavn H (central) station
Though if you haven’t reserved and will be taking a Lyn service from Kobenhavn/Copenhagen - you will be more likely to find seats if you join the train at Nørreport or Østerport stations.

At busy times the 30kr reservation fee can save a lot of stress.

On particularly crowded trains the only 2nd class seats available can be the bench seats opposite the toilets (so be careful to close the toilet door after you have finished using it).

If you haven't reserved you may have to move through the train to look for spare seats, though most Lyn services are only 6 coaches long.

The IC3 trains aren’t the most stylish, but they are comparatively comfortable when not overcrowded.

If you travel 1st class, jugs of boiling water are provided so that you can help yourself to a complimentary tea or coffee, cold drinks and snacks are also provided in 1st class.
Otherwise the difference between 1st and 2nd class on these trains is fairly minimal.
The seats are virtually identical, but the seat arrangements is 2 + 1 in 1st class instead of 2 + 2 in 2nd class, and 1st class has slightly more leg room.

There are also vending machines on board for drinks that are available to all, there is no bar/bistro coach or counter.

The trains also have symbols showing that Wi-Fi is available, but this seems to be hit and miss - don't rely on being able to log on.

Something to look out for is that if you want to use the blinds on these trains, you have to secure it in place, using the pegs attached to the window frame.

Another quirk of the IC 3 trains is that the trains are arranged into sets of 3 coaches/cars, but in the set of 3, the middle car/coach has no door.