The RMT Union is highlighting the issues experienced by rail workers who say they are facing daily abuse, including assaults and spitting.
The organisation is demanding stronger action from Govia Thameslink, which runs Thameslink, Southern, and Gatwick Express services.
The operator says it’s “fully committed” to tackling the issue and keeping staff safe.
RMT General Secretary Eddie Dempsey said: “The level of violence on GTR’s Southern and Gatwick Express services and stations, has reached a crisis point and is totally unacceptable.
"Our members are being assaulted, threatened and abused at work and the company is not doing enough to stop it.
"GTR must take urgent action now to protect staff and passengers or we will have to consider all our options, including industrial action.
"We will not tolerate a situation where workers are left exposed and unsupported while this behaviour goes unchecked."
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