> Collisions happened more frequently than they do today, but they generally did not kill. And while there exist news reports of incidents that sound suspiciou

> Collisions happened more frequently than they do today, but they generally did not kill. And while there exist news reports of incidents that sound suspiciously like signal system design issues – for example, a B train which rear-ended the system’s revenue collection train in Brooklyn in 1968 – these seem to have been rare. Most of the accidents whose stories made it into the press seemingly had little to do with signal system’s deficiencies. Where is the NTSB (national transportation safety board) in all of this? You shouldn't have to search around for news reports to find out about when incidents took place on a transit system operated by the government. If NYC isn't adequately investigating, cataloging, and dealing with these incidents, why isn't the NTSB doing anything about it? While the article is very interesting from an engineering perspective, it boggles the mind that such a safety critical piece of infratstructure is allowed to operate in an opaque manner with little or no oversight.