This link doesn't exactly evaluate just the east coast performance, but does give a pretty good overall view of how Amtrak is doing.

Interestingly, it does seem that the NE corridor does make money, depending on what part of Amtrak's accounting reports you read.

Amtrak Report
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)