The country's train traffic was paralysed on Friday morning, as employees of railway operator DSB called a meeting as a part of a union protest.
National broadcaster DR reported that the country's intercity connections were delayed across the country.
DSB's website announced that trains in Copenhagen, Århus, and Odense were not in operation at the moment, due to `lack of personnel'.
DR said train personnel had abandoned trains, leaving passengers stranded at whatever station their train had reached. It appeared that passenger attendants, not train conductors, had gone on a strike.
The action came at the worst time possible for DSB and passengers, as Friday is one of the most popular days for workplace Christmas bashes, causing a large share of the nation's workforce to leave their cars at home and take the train to work.
Railway authorities said suburban S-trains were still running, as was the Svendborg railway.