1. Collision or serious accident in which a train is badly damaged 
2. Anything that is a complete disaster

Encyclopedia: Train wreck

• sodium hydride
• sodium hydrogen carbonate
• sodium hydroxide
• sodium hypochlorite
• sodium iodide
• sodium lauryl sulfate
• sodium lauryl sulphate
• sodium nitrate
• sodium nitrite
• sodium orthophosphate
• sodium phosphate
• sodium pyrophosphate
• sodium salicylate
• sodium silicate
• sodium sulfate
• sodium sulphate
• sodium thiopental
• sodium thiosulfate
• sodium thiosulphate
• sodium tripolyphosphate
• sodium-vapor lamp
• sodium-vapour lamp
• sodoku
• sodom
• sodomise