Last year, 54 people were killed by trains after falling, jumping, or being pushed onto New York City subway tracks.

The unusually deadly year has prompted calls for the Metropolitan Transit Authority to find a solution to keep subway riders safe.

A lot of ideas have been suggested, but so far none could actually save lives without costing the nearly broke MTA hundreds of millions of dollars.

Here's what the MTA has come up with:

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Produced by Daniel Goodman