A very looong train
This photo is from a 1.2 mile long RhB train (Rhätische Bahn, narrow gauge) on the Albula Line between Bergün and Preda in Switzerland. It is composed of 25 individual trains with 4 carriages each for a total of 100 cars.
As it traveled through the Swiss Alps on November 4, 2022, it set a world record for the longest passenger train on the occasion of the 175th anniversary of Switzerland's first railway.