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UPDATE 2-Harvey may cause long-term disruption on Houston's rail tracks

(Adds details of companies affected by Harvey in Houston)

Aug 30 (Reuters) - Major U.S. railroads have warned it could be a long time before normal operations resume in the Houston area where Tropical Storm Harvey caused catastrophic flooding that overwhelmed roads, bridges and train tracks.

The closure of rail lines in the grain transport hub and nexus for cross-border traffic with Mexico presents a costly headache for customers ranging from automakers to farmers who use the lines to send ethanol, cereals and auto parts to and from Mexico or to be loaded onto ships.

The top two U.S. railroads, Union Pacific Corp and Berkshire Hathaway Inc's BNSF Railway, have suspended operations in the area affected by the storm, as has regional railroad Kansas City Southern.

"We don't have a historical precedent with this one," said Thomas Williamson, owner of Florida-based rail broker Transportation Consultants Co. "I expect service to be disrupted anywhere from two to six weeks."

Omaha, Nebraska-based Union Pacific said in a customer announcement it aimed to begin cleanup operations at two yards in Houston either on Wednesday or Thursday.

According to a Midwest-based conductor at the railroad who spoke on condition of anonymity, parts of Union Pacific's Englewood Yard in Houston were flooded as of late Tuesday.

Union Pacific, the No. 1 U.S. railroad, told customers on Wednesday it was using helicopters and drones to inspect track and facilities in areas without road access.

The company said the "majority of areas east of Houston are still inaccessible at this time." Union Pacific has been rerouting traffic away from Houston.

BNSF said in a Tuesday customer announcement that normal train flows in the area were unlikely to resume for "an extended period."

A spokesman at CSX Corp, the No. 3 U.S. railroad, which has so far been unaffected by Harvey, said on Wednesday it was "closely watching the weather conditions in Louisiana and the southwestern portion of our operating network."

UNKNOWN COSTS

The storm has caused widespread business disruptions.

Loadings of wheat, corn and sorghum onto ships for export have been halted in Texas.

Coastal grain elevators have not been significantly damaged but have been unable to receive supplies.

Archer Daniels Midland Co's grain elevators remained operational in Corpus Christi and Galveston, but loadings there cannot resume until rail transportation begins again, a spokeswoman said.

Louis Dreyfus Co, which has grain terminals in Beaumont and Houston, did not return requests for comment on Wednesday.

Kansas City Southern, with much of its business focused on U.S.-Mexico trade, may have greater exposure to disruption caused by the storm than the other two railroads, said Cowen & Co analyst Jason Seidl in a client note.

Kansas Southern said in its last update on Monday that it had stopped traffic through affected areas. It said it would update customers as the situation develops.

Rail customers and their transportation providers will find ways to bypass Houston, said Rick Ehrensaft, operating officer at Grand Worldwide Logistics Corp, a warehouse and third-party logistics company with locations across the United States.

"There will be some triaging using other modes of transportation to get around anything that's been routed through there," he said. "What that's going to do to costs is unknown."

Once the rails are up and running, railroad operators will likely benefit as goods for recovery and rebuilding are sent to the region, said independent railroad analyst Anthony Hatch. "We can be sure that the rails will be quicker to recover than most as they have been through this before."

The railroads all have experience with storm disasters. Hurricane Katrina in 2005 damaged about 200 miles (320 km) of CSX track on the Gulf Coast. That caused about $250 million in damages, 90 percent of which was covered by insurance. (Reporting by Nick Carey in Detroit and Eric M. Johnson in Seattle; Additional reporting by Jarrett Renshaw in New York and Michael Hirtzer and Karl Plume in Chicago; Editing by Bill Rigby and Peter Cooney)