It turns out that New York City subway conductors are like actors: They have scripts they are supposed to follow.

The scripts are in a blue booklet issued by New York City Transit, which wants conductors to keep it close to the vest — almost literally. The booklet is small enough to fit in a pocket so conductors can refer to it if they forget what to say.

The booklet was rewritten last year under Sarah Meyer, a communications and marketing executive who has since joined the transit agency as its chief customer officer. She put the emphasis on sounding more conversational and avoiding transit-jargon phrases like “signal malfunction” or “There’s train traffic ahead of us.” (“Makes us sound helpless,” explained Ms. Meyer’s version of the book, which replaced one issued in 2015.)

Now she is about to rewrite the rewrite. She is looking to bring out another version early next year with additional revisions, many based on feedback from passengers and from transit employees.