The horrific subway bombings in London [front page, July 8] highlighted a simple fact: No one in the subway cars knew what to do when the lights went out. Could they exit the train safely? Or would they be electrocuted on the tracks? Or would they burn or choke to death waiting for help?

Last year Metro created a program for volunteers called Metro Citizen Corps, but it is little known. Metro should do more to promote the program and the training of rider-volunteers in the basics of what to do in an emergency. Give the volunteers yellow armbands or something. Then make sure the public knows that the volunteers know what to do in an emergency and are trained to make the right choices when the worst happens.

With such a corps, Metro riders would know that someone in their car could help them get out alive. This would go a long way toward doing away with the one thing the terrorists seek to create: terror.

DON NUNES

Lusby

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As I understand it, some of the bombs that have been placed in mass transit systems, perhaps including those in London on Thursday, have been detonated by cell phones.

Wouldn't it make sense during heightened states of emergency that cell phone service be shut down in the Metro system? Or maybe calls could be allowed only to originate in the Metro system but not be received there at such times, because the cell phone ringers apparently were rigged to set off the bombs remotely?

ROY MORRIS

Arlington