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A fire that began with a homeless person trying to keep warm by igniting wood and refuse in a shopping cart has crippled two of the city's subway lines, which might not be restored to normal capacity for three to five years, officials said today.

The Sunday afternoon blaze in Lower Manhattan was described as the worst damage to subway infrastructure since the terror attacks of Sept. 11, 2001. It gutted a locked room that is no larger than a kitchen but contains some 600 relays, switches and circuits that transmit vital information about train locations.

"This is a very significant problem, and it's going to go on for quite a while," said the president of New York City Transit, Lawrence G. Reuter. He estimated that it would take "several millions of dollars and several years" to reassemble and test the intricate network of custom-built switch relays on which the two lines rely.

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