| 1. | The collapse was blamed on weakened steel girders under the courtyard.
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| 2. | Those are steel girders and pickup trucks swirling around up there.
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| 3. | Another seeks ways to keep girder welds from cracking under stress.
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| 4. | Over the next few years, NASA will add additional girders.
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| 5. | Walheim agreed and called the girder " beautiful ."
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| 6. | They also tested the railcar mounted to tracks on the girder.
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| 7. | They also tested a railcar mounted to tracks on the girder.
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| 8. | The girder and the railcar cost close to dlrs 1 billion.
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| 9. | Fish plates are iron girders that hold the train tracks together.
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| 10. | The girder will be attached to the space station on Thursday.
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