Following the incident, Mayor Rafał Trzaskowski convened an emergency response team.
The fire broke out around 1 a.m., severely damaging cables and the train control system, according to city officials.
Trzaskowski said technicians were unable to access the affected site until firefighters finished their work, adding that the damage would require several hours of repairs followed by safety tests.
Firefighters worked to extinguish the flames, clear smoke from the station, and investigate the cause of the incident.
Sixteen fire trucks were deployed, and replacement transport services were set up along the entire M1 line.
The M2 line continued to operate but ran with reduced frequency.
During a press briefing, officials described the incident as a serious disruption.
Monika Beuth, spokeswoman for Warsaw City Hall, said full service on the M1 line was unlikely to be restored before the end of the day.
However, the northern section of the line, between Dworzec Gdański and Młociny stations, was reopened to passengers.
(mp/gs)
Source: IAR/X/@warszawa/@trzaskowski_/Facebook.com/Miasto Stołeczne Warszawa