Health bosses at Whittington hopsital in North London claim their plan to close wards, axe jobs and sell buildings could be a template for a new kind of district general hospital.
They want it to put more emphasis on treating patients at home. And they also plan to cap the number of births.
The scheme has provoked widespread local opposition.
Our Political Correspondent Simon Harris has the full story.
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Rail union RMT have slammed the move saying the company MTR is set to make "a killing at the British taxpayers' expense".
The meeting was arranged in the wake of Wednesday's terrorist murder of four people in Westminster.
Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.