SAN JOSE -- Bomb squad investigators found that a suspicious black backpack causing a scare at a train yard south of the Tamien Station on Friday afternoon contained wires and fitness weights, according to sheriff's officials.
The finding was made when a robot that approached the open backpack -- which had clearly visible wires sticking out the top -- and then inverted it, dumping the contents to the ground just before 5 p.m.
"That's what the robot is for," said Santa Clara County sheriff's Capt. Rick Sung.
Sung said that investigators were called to the scene shortly before 3 p.m., after a security guard found the backpack sitting in front of a parked train.
The backpack was found in a yard used for Altamont Corridor Express trains, said Caltrain spokeswoman Christine Dunn.
"It was something that was found in an area where people are not allowed entry," she said. "It's where the ACE trains are parked."
Dunn said the maintenance yard is about a quarter-mile south of the station.
Around 4:40 p.m., ACE put out a notice advising passengers to expect delays and that trains were being held at the San Jose station. ACE passengers reported being backed up at the Great America Station around 5 p.m.
The Tamien Station is at 1355 Lick Ave.
Contact Eric Kurhi at 408-920-5852. Follow him at Twitter.com/erickurhi.