Broadchurch star Olivia Colman and The Walking Dead's David Morrissey head the cast in new BBC One drama The 7:39.

Sheridan Smith and Scott & Bailey's Sean Maguire will also appear in the two-part romance - with Smith playing Colman's love rival.

The 7:39 has been penned by David Nicholls (One Day, Starter For Ten) and is described by the writer as "a love story for grown-ups".

"I'm delighted to be writing for the BBC again and working with such a terrific cast and production team," said Nicholls.

Exploring the romantic lives of commuters on the 7.39 train into Waterloo, the drama focuses on frustrated husband Carl (Morrissey), his wife Maggie (Colman), health club manager Sally (Smith) and her personal trainer/fiancé Ryan (Maguire).

Over a fight for a seat, Sally and Carl meet and the pair soon find their lives transformed by their daily train journeys.

Ben Stephenson, Controller BBC Drama Commissioning, said: "I'm bowled over by the award-winning and stellar cast starring in The 7.39.

"But it's perhaps no surprise given the wonderful scripts by David Nicholls, in his first television drama since his novel, One Day, became a worldwide phenomenon."

A transmission date for the drama has yet to be announced.