TLDR & clicked the link so you don't have to:

(...) The Rhaetian Railway train – comprising four engines and 100 carriages for a total length of 1,910 metres - travelled on the Albula/Bernina route from Preda to Alvaneu in southeast Switzerland on Saturday afternoon.

The entire journey of about 25 kilometers (15.5 miles) took about an hour. Rail fans lined the valley to watch the train wind its way through the Alps (see video below).

The world record was officially confirmed on site by Guinness World Records, Rhaetian Railway said in a statementExternal link. The previous world record of 1,732.9 metres dates from 1991.

Rhaetian Railway Director Renato Fasciati said the record attempt was intended to highlight some of Switzerland's engineering achievements and to celebrate 175 years of Swiss railways.

Pretty crazy, nearly 2km long train.

Snow piercer anyone?

Would not want to offload that train.

They should have made the train 25 kilometers long, so the travel time would be reduced to 0. You may have to walk between cars to get off.

No doubt paid by money looted from poor countries.