The May 25 accident occurred when the UP train hit the side of a Burlington Northern Santa Fe freight train at the rail intersection near Chaffee. The accident derailed about two dozen rail cars, destroying columns supporting a highway overpass. No one was seriously injured.

The National Transportation Safety Board released its preliminary report Friday. The report says signal data show the UP train had a signal indication to stop, while the BNSF train had a signal to proceed.

The report also says the damage is estimated at $11 million.

The overpass is used by 400 to 500 cars a day.