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I propose to include on the category page: "Only original derailments should be placed here. Derailments caused by Category:Train collisions (see conditions written there) or Category:Level crossing accidents should only be included in those categories, unless the resulting derailment had grave consequences by itself." Generic derailments would have causes of their own: track damage, bridge failure, landslide/flood/wind, overspeed, wheel/axle failure, distortions by braking, buffers jamming, track ending without advance notice, things lying on the tracks etc..
Example: the accident at Lambrecht (in List of rail accidents (2010–present)) was caused by a truck dropping onto the tracks, cutting through the train's side. The derailment did not distort the train. Therefore, derailment is only secondary, but lacking a category for this kind of interference, the accident would be placed directly under Category:Railway accidents in Germany.
BTW: Category:Train collisions is a creation by me without askingbeing bold, I am populating it. --Mopskatze (talk) 23:54, 5 April 2017 (UTC)[reply]
According to my wording, Great Heck rail crash would be in derailments (indirect grave consequences of derailment) and collisions. Ufton Nervet rail crash would be in level crossing accidents (accident caused by suicide) and derailments (many people killed or injured). For things/vehicles/bridges/trees/UFOs dropping onto the track, also for landslides and floods, a category "track obstructions/incursions" or similar may be useful (only notable cases, of course); level crossing accidents may then be a subcategory of that. --Mopskatze (talk) 23:38, 6 April 2017 (UTC)[reply]
