CLOSED set filming at Severn Valley Railway has prompted social media users to speculate on which mystery movie is being shot there.

Curious Wyre Forest residents spotted trailers, film crews, and a helicopter linked to the secret filming at the historic railway, which took place from Monday, July 15, until Wednesday, July 17.

Some Facebook users have suggested that a new Sherlock Holmes film could be the production being filmed there.

One user said: "Some of the names on side of vehicles referred to characters from Sherlock."

People have speculated it could be 'Sherlock Holmes 3,' a film set to be released in 2021 starring Robert Downey Jr and Jude Law.

Others have suggested it might be the upcoming 'Enola Holmes,' a film about Sherlock's child sister, which will star Henry Cavill and Helena Bonham Carter, and Millie Bobby Brown.

One user also had an inkling that the filming could be for the new Bond movie.

A spokesperson from SVR says the filming was part of a "standard closed set filming contract."

"We know very little and it's very secret at this stage, not even the volunteers know about it.

"Because of it being a closed set, this has brought a lot of attention."

Parts of the SVR were closed due to the filming, but it is now fully open and services are running as normal.