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

Encyclopedia: Train wreck

• arboriculture
• arboriculturist
• arboriform
• arborisation
• arborise
• arborist
• arborization
• arborize
• arborolatry
• arborous
• arborvirus
• arborvitae
• arbour
• arbovirus
• arbutus
• Arbutus menziesii
• Arbutus unedo
• arc
• arc lamp
• arc light
• arc-boutant
• Arca
• arcade
• arcaded
• Arcadia