The track underwent routine maintenance on July 25, a procedure called "tamping," and the derailment occurred near the area where that maintenance ended, Ms. Carmody said.
RAF maintenance ended at the St Athan base earlier this year with the loss of 200 jobs, while multimillion-pound plans for a defence training academy and maintenance super-hangar were scrapped in recent years.
State maintenance ends, and the road continues east.
State maintenance ends at an intersection with FM 3487 (Culebra Road), slightly west of Interstate 410 (I-410).
State maintenance ends at the intersection with the off-ramp from northbound I-75 exit 338.
County Route 626 becomes a divided highway before reaching an intersection with New Jersey Route 47, where county maintenance ends completely.
SR 174 continues to the Grand Coulee Dam federal reservation and state maintenance ends through the area.
Just beyond the bridge, SR 47 leaves the freeway, which continues northeast as SR 103, onto Henry Ford Avenue, and state maintenance ends.
State maintenance ends just after the Jefferson Boulevard interchange, and the road — now maintained by the city of West Sacramento as Tower Bridge Gateway — crosses the new Garden Street at an at-grade intersection.
