Agents from the DEA and Border Patrol released more details about the cross-border drug tunnel discovered on Tuesday. Initial reports had described the tunnel as elaborate, new details revealed today show just how elaborate it was.

Electric rail cars ran the length of the 600-yard tunnel, special agent Derek Brenner of U.S. Immigration and Customs Enforcement told the Associated Press. In addition to the railway, smugglers used a hydraulic lift, descended down a staircase to the tunnel which had wood floors from one end to the other.

The bust, said Brenner, was one of the largest in history, with agents seizing an estimated 32 tons of marijuana, 17 of which was found inside a warehouse in Otay Mesa.

"This is an incredibly efficient tunnel designed to move a lot of narcotics," Benner told The Associated Press.

Added William Sherman, the DEA agent San Diego who heads up the San Diego office: "I would say it's probably as sophisticated as any we've ever seen."

It is the second elaborate tunnel found in the last two weeks, both linking warehouses near the Tijuana Airport to warehouses in Otay Mesa. In all approximately 49 tons of weed was discovered in the two tunnels.

*picture from DEA website of November 16 bust