The roof of the railway station in Northwich has collapsed sending a shower of debris on to the platform and waiting room below.
There have been no reports of injuries so far, but train services have been disrupted.
Images and videos circulating on social media show a pile of rubble on the platform of the station as well as inside the waiting area.
Northwich resident Hollie Sephton told Cheshire Live she was just walking up to the platform when the roof fell.
She said: "I walked up and the roof just fell on its own, that’s literally all that happened. It was complete silence one minute, and then all of a sudden it just fell.
"Everyone jumped into action though and everyone was fine. Fire brigade were rung within a minute."
Train services in the area are set to be either cancelled or delayed for up to 40 minutes with disruption expected "until the end of the day".
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A Cheshire Fire and Rescue Service spokeswoman said: "Firefighters are currently at Northwich Train Station following reports of a wall and roof having collapsed, blocking the rail line.
"The area has been cordoned off by firefighters and there are cancellations to train services.
"Everyone present at the time is accounted for. The crew is assessing the scene with representatives from Network Rail and has notified council engineers."
Weaver Vale MP Mike Amesbury said he was "shocked" to learn of the roof collapse and said he will raise the matter with the Transport Secretary.

He said: "I was shocked to learn of a serious roof collapse at Northwich Railway Station this morning. My team have spoken to police and, miraculously, it appears nobody has been injured although there has been major disruption to the railway.
"Clearly there will need to be an official investigation to understand what has happened.
"Having just spoken to a senior Northern Rail manager, the priority is to make the area safe and get the trains running again. I am raising this matter with Transport Secretary Grant Shapps as a matter of urgency."