| December 23, 1933|
| Saint‑Michel‑de‑Maurienne derailment, Bihar train derailment, 1995 Baku Metro fire, Balvano train disaster, Tsurumi rail accident|Lagny-Pomponne rail accident Wikipedia
The Lagny-Pomponne rail disaster occurred on 23 December 1933, between Pomponne and Lagny-sur-Marne (), 20 kilometres (12 mi) east of Paris, when the 4-8-2 locomotive of the express for Strasbourg crashed at 110 km/hr (65 mph) into the rear of an auxiliary train bound for Nancy, which was stopped on the railway. The impact crushed and splintered the last five cars of the Nancy train, older wooden cars pressed into service for the holidays. Both trains were full of people going home to their families for Christmas. 204 people died and 120 were injured. It is second the worst railway disaster in French history, after the 1917 Saint-Michel-de-Maurienne derailment, and the worst ever in peacetime.
The accident occurred in thick fog and it has been suggested that a build-up of ice on the AWS ramp may have prevented correct operation of the equipment.