Although not every child’s recording made the final cut, the project has aimed to broaden acceptance of children with autism and to give them a chance to have their voices broadcast at train stations, which many of them adore. Many children with autism focus intensely on the technical aspects of trains and buses, subway maps and train schedules, said Jonathan Trichter, a co-founder of the Foundry Learning Center — a school for children with developmental disabilities in Manhattan — and the driving force behind the public service announcements. Children with autism also latch onto phrases they hear in spaces where they are intensely focused and use them as some of their first means of communication, Mr. Trichter said. “As a result, it is not unusual for a child in New York City who is on the spectrum to have, as his or her first full sentence, something like ‘Stand clear of the closing doors, please,’” Mr. Trichter said, reciting the familiar warning that plays throughout the city’s subway system. That phenomenon, he said, gave him the idea to pitch the children’s announcements to the Metropolitan Transportation Authority in New York, which was the first agency to broadcast them last April.

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