Astronauts from the Space Shuttle Atlantis are making their fourth and final spacewalk to erect handrails that will make such walks easier for future astronauts. 

Astronaut and veteran NASA spacewalker Jerry Ross said it is a good day for a stroll as he emerged from the international space station. 

Working under powerful halogen lamps, he and his partner are installing handrails on a girder, relocating tools for spacewalks on the next shuttle visit in May and adjusting a thermal blanket partly obstructing an antenna. 

The girder is connected to the first railroad in space, which failed its first test Monday when a computer suspended operation of the slow-moving rail car. NASA decided the problem was weightlessness, which allowed the car to float off its track just enough so that sensors could not detect its presence. 

The seven Atlantis astronauts are set to leave the space station on Wednesday and land at Florida's Kennedy Space Center on Friday. 

Some information for this report provided by AP and Reuters.

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