Some of the major attacks on passenger trains and subways around the world:
July 11, 2006: Eight coordinated bombs explode on trains in Bombay, India, killing 147 and wounding hundreds.
July 7, 2005: Four suicide bombers attack the London subway and bus systems, killing 52 people and wounding 740.
March 11, 2004: Ten backpack bombs rip through four trains in Madrid, killing 191 people and injuring more than 1,200.
March 20, 1995: A secretive doomsday cult plants containers filled with the nerve gas Sarin in the Tokyo subway, releasing toxic fumes that kill 12 people and sicken 5,000.
March 12, 1993: Muslim underworld figures tied to Pakistani militants carry out a series of bombings that struck Bombay's stock exchange, trains, hotels and gas stations in the city, killing 257 people and wounding more than 1,100.