Question: If you see train tracks that are buckled in multiple spots, what can you conclude about when and how they were installed? They were installed

If you see train tracks that are "buckled" in multiple spots, what can you conclude about when and how they were installed?

They were installed in hot weather and placed too close together.

They were installed in cold weather and placed too far apart. 

They were installed in hot weather and placed too far apart.

They were installed in cold weather and placed too close together.

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