Much-loved characters are to be killed off in a massive disaster which causes carnage in Coronation Street, show bosses revealed today.
The viaduct, which has long been a Weatherfield landmark, is to collapse, sending a tram careering off the bridge and onto the cobbles.
The gripping storyline marks the show's 50th anniversary in December and will leave some favourites from the show injured.
Producer Phil Collinson said: "We'll be losing some well known, well loved characters."
Show bosses said it will be the biggest stunt in the soap's half-century history.
Collinson said: "If you're listening in Weatherfield it's not good news. One fateful night at the beginning of December the viaduct's going to collapse, down by the corner shop and the Kabin, and a tram is going to crash into Coronation Street.
"People are going to be injured, people are going to be killed. It's a big, big story for us and one fateful night will play out across a whole week."
Collinson has drafted in special effects experts from The Mill, who have worked on Doctor Who and Gladiator, and producers have worked with GMPTE, which runs Metrolink trams in Manchester.
The producer added: "We'll be using all the wonders of modern television production to bring you a disaster that will rock the lives of everyone in Weatherfield.
"At the heart of the drama, though, will be ordinary people on an ordinary street battling adversity -- the template for the programme created by Tony Warren 50 years ago."
The image of the tram going across the viaduct at the corner shop end of the street has been a feature of the opening titles of Coronation Street for the past nine years.
In the interview, Collinson hinted that events would take a "sinister turn" for John Stape, and that the love triangle storyline between Molly and Tyrone Dobbs and Kevin Webster would "roll on for a long, long time".