The incident caused SANDAG to suspend rail service temporarily over concerns of further collapse. Later, geotechnical experts determined that train service can be operated safely at a reduced speed, according to the City of Del Mar. Steel beams are being used to support bluffs underneath coastal train tracks to prevent erosion. NBC 7's Joe Little has more on the bluff stabilization project. But beachgoers were still warned to avoid sitting, standing or walking within 50 feet of the bluffs on the beach below due to cracks at the top of the bluffs that posed a risk. The cliffs are increasingly threatened by coastal erosion. SANDAG's work includes drilling holes into the bluffs, placing anchors and filling the holes with concrete.