The disastrous Paris Métro train fire occurred on the evening of August 10, 1903, on what was then Line 2 Nord (2 North) of the system and is now Line 2. There were 84 deaths, most at Couronnes station, so it is also known as the Couronnes disaster.
The line, less than a year old, was mostly underground, but included an elevated section four stations long from Boulevard Barbès to Rue d'Allemagne inclusive (today Barbès - Rochechouart and Jaurès respectively; see List of stations of the Paris Métro). It was worked by a mixture of 4-car (single) and 8-car (double) trains, of the M1 stock, which turned on loop tracks at each end of the line so that the same car remained in front. On a single train only the front car had motors; a double train had one motor car at each end, but the power for both cars was routed through the front car, as multiple-unit train control had not yet come into use.
On August 10, the first sign of trouble was at 6:53 p.m., when double train 43 completed the climb to Boulevard Barbès station with heavy smoke pouring from one of the motors on its front car, car M202.
The train's passengers were evacuated onto the platform and its shoes were lifted from the third rail to cut off the power, whereupon the burning subsided. But with the station full of annoyed passengers, the staff now focused their attention on restoring service. That meant moving the train, and there was no siding before the line descended back into the tunnel.
The fatal decision was made to lower the shoes and move it under its own power, when in fact the motor had not simply overheated, but had a short circuit. Train 43 left the station at 7:05 p.m. amid a cloud of black smoke, but before it had passed two stations, the fire on car M202 had reignited with greater intensity.