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Allison Janney boards The Girl on the Train

Allison Janney is the latest to join the cast of DreamWorks’ “The Girl on the Train.”

Janney will play a police detective in the pic about hard-drinking recent divorcee Rachel Wilson (Emily Blunt), who spends her daily commute fantasizing about the seemingly perfect couple that live in a house that her train passes every day. When Rachel hears that Megan (Haley Bennett), the wife, has gone missing, she tries to find out what happened.

Rebecca Ferguson plays Anna, the former mistress and now new wife of Rachel’s ex husband, Tom.

Justin Theroux, Jared Leto and Edgar Ramirez are also attached to the film.

Tate Taylor is directing from a script Erin Cressida Wilson adapted from Paula Hawkins’ bestselling novel.

“The Girl on the Train” will release on October 7.

Variety first reported the news.

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