Tests like these prove the flasks could survive a 100-mile-an-hour train collision. they are designed to withstand a fire burning at 1,400 degrees fahrenheit for 30 minutes with water in the compartments. be b but according to john large, that could be their fatal flaw. >> i was concerned about the thermodynamic performance. it's in a fire, there's no way of planning for the damage that could occur. this flask is full of water, so it turns into a pressure cooker. >> such conditions could occur in a railway tunnel fire. july 18th, 2001, baltimore, maryland. population 600,000. a 60-car freight ...