Almost 100 people were spotted walking along train lines in the Illawarra in the last financial year.
NSW TrainLink said there were 95 instances where trespassers on the South Coast line were reported to police in 2016-17.
“NSW TrainLink’s regional customer support centre based in Wollongong actively monitors and reports on locations where there are higher levels of trespass, including level crossings or scenic vantage points,” a NSW TrainLink spokeswoman said.
“We are concerned about trespassing because of the potential impacts on members of the community and our staff who witness these incidents.”
The spokeswoman said, once a trespasser was spotted, trains operated at lower speeds until it was confirmed the line was clear., causing delays for rail commuters.