Cumbie's Twitter account is protected but according to The Daily Mail, he wrote, 'I just wish it was me....'
Details of the accident are not known.
Caleb, who was a Locomotive Engineer/Conductor at Alabama Warrior Railway, according to his Facebook page, finished in the top 10 when he competed with Colton on Blood vs. Water.
"Caleb was an amazing man and friend," fellow contestant Aras Baskauskas told PEOPLE. "One of the sweetest and most sincere humans I've ever come across. I am gutted by his loss. My thoughts and prayers are with his family."
Bankston -- a contestant on "Survivor: Blood vs. Water" last year -- was checking on something in the small space between two of the cars when the train went off the tracks. Cops say the rear car slammed into the forward car ... with Bankston caught helplessly in between.
Since this is an industrial accident, Birmingham PD says the Federal Railroad Administration and the railway company’s safety officer will conduct separate investigations.
So far, it is unknown what caused the derailment. We're told there was one oPublishther worker on the train at the time of the crash ... he was not injured.
Bankston was one of the kindest, most patient Survivor contestants in recent memory.
Watch a scene that displays the devotion to his fiancé Colton, AFTER THE JUMP...