Service on the Long Island Rail Road's Ronkonkoma line is getting back to normal after a freight train derailment Thursday.LIRR officials say there will be normal westbound service Friday morning. Customers at the Deer Park and Brentwood stations are being advised that westbound trains will operate on eastbound tracks Friday morning. The LIRR says the 8:14 a.m. eastbound train from Penn Station will terminate at Farmingdale. Bus service will be provided between Farmingdale and Ronkonkoma. The 5:11 a.m. train from Penn Station also terminated at Farmingdale. The freight train derailed Thursday around 9 a.m. near the Deer Park station. The LIRR says six cars of the train came off the track while one car flipped onto its side, unloading the construction materials it was carrying.Service was suspended Thursday morning for more than an hour and buses were used for westbound commuters. Trains ran on a clear track between Farmingdale and Ronkonkoma for eastbound commuters.Service was suspended again Thursday night as crews worked into the morning to remove the derailed car.Freight train derails; service temporarily suspended Long Island Rail Road