As mentioned previously, it's very hard to rank definitively and generally which delays are worse or better.  For example, a delay caused by someone holding the doors is frequent but low in number of trains delayed, whereas a delay caused by an injured person is less frequent, but high in number of trains delayed.   So, we decided to design scorecards for each cause that can communicate their impact across all metrics at a glance.   An MTA board member would be able to compare different causes as well as metrics within causes.
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