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Mr Rozario said he and a colleague were doing a routine audit of a railway level crossing about 2pm on Thursday, January 15.
"We didn't see or hear anything when we were there," he said. "I took about 10 or 12 photos, facing east and west.
"Then I came back to the office, downloaded the images and noticed an object in one photo.
"I still don't know what it is. I passed it around the office and people didn't know what it was. A few said it didn't look like a bird, an aircraft or even a bug in front of the camera."
Mr Rozario said a train passed through the crossing just seconds after the photograph was taken and believes a passenger may have spotted something in the sky.