he first railway in outer space was ready to roll after astronauts from the space shuttle its Lraugural run.

The rail can installed outside the International Space Station on the crew's first space walk, will have a top speed of just one inch per second. And ground controllers said they may not open it up all the way in their first test on Monday.

The rail car is part of the 44-foot-long S-Zero truss, the centerpiece of what is to be a 360-foot girder that will support an acre of solar panels generating power for use throughout the space station.

In spade walk looking more than six hours, astronauts Steve Smith and Rex Wilhelm, the same team that mounted the new truss segment onto the station, which road to space in the shuttle's cargo bay, NASA said the mobile transporter, as the rail over is officially known, was ready for its first test on Monday.

"As far as speed in concerned it's probably going to be in the fractions of an inch velocity-on the order of a tenth of an inch per astound," Ben Sellari, the launch package manager at Mission Control, said of Monday's test speeds.

The small trolley is designed to rill the station's giant robotic from one abstractions site to another as work progress on the station over the next several years.

The big Arm, as it is down, is 58-foot long and able to heft entire station modules out of shuttle cargo bays.

The two space walk also rewired the big Arm so it could draw power through the S-Zero truss.

Right more truss segments will be added on future missions. And a handcar will be added to the rail system go as tonal can move more easily along the trugs, which will be a longer then a football field.