The derailment of 21 cars of a CSX Corp. freight train last Friday cost Metro almost $250,000 in damage, according to preliminary estimates released yesterday.

The cars slipped off the CSX track early Friday just north of the Takoma Red Line station; 10 cars spilled onto Metro property.

Metro had to replace 1,500 feet of fence and repair 1,000 feet of inbound track and 100 feet of outbound track, General Manager Carmen Turner said. At the site of the derailment, the CSX and Metro tracks are 20 feet apart, measured from center to center.

Transit officials also said they were reviewing their liability agreements with CSX.

In a separate development, Turner reported that riders at the opposite end of the Red Line last Friday afternoon experienced minor delays over more than seven hours while Metro repaired a rail that had "buckled" slightly. The kink, located on the outbound track between the Medical Center and Grosvenor stations, was attributed to expansion of the rail as temperatures that day rose from 66 degrees early in the morning to a high of 89, said Fady P. Bassily, assistant general manager for rail operations. the inbound track in that area while repairing the track.

Temperature changes cause Metro rails to buckle about three or four times a year, Bassily said.