Odd railway gauges

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…showed last 75 words of 337 total…boosters (SRBs). Made by Thiokol in Utah, these SRBs had to be shipped to the launch site via the railway. During its travel to the launch site, the railway ran through a tunnel encompassed by mountains. Because the SRBs had to go through the tunnel and the tunnel is only slightly larger than the width of the railway, the designers of the SRBs had to make them a little smaller than what they had wanted.