ORLANDO, Fla. - Two American astronauts helped move a stalled railcar back into place outside the International Space Station on Monday, quickly finishing the primary job of an unplanned space walk before moving on to other housekeeping tasks.

NASA's one-year spaceman, Scott Kelly, and astronaut Timothy Kopra took just a little more than a half-hour to release brake handles on the railcar and help guide it four inches back into place. The railcar needed to be moved so a cargo ship filled with nearly three tons of food and supplies could dock at the orbiting space lab on Wednesday.

"I see motion!" Kelly said after the astronauts released the brake handles and a robotics officer in Mission Control sent a command to move the railcar.

"Good news! It appears to have reached the work site," astronaut Mike Hopkins in Mission Control told the spacewalkers a short time later.

The space walk more than 250 miles above Earth was just scheduled on Friday.

The railcar is part of the station's mobile transport system, which is normally used to transport people and equipment, including the station's big robot arm.

After engineers on the ground confirmed the railcar was latched in place, Hopkins told the spacewalkers, "It's in a good config. Well done!" With their primary task completed, Kelly and Kopra split up to work on separate tasks of routing cables along the space station. Kopra also retrieved some tools stored on the side of the station for a future spacewalk.

Finished with their work, the astronauts returned inside the space station more than three hours after the start of their space walk.