Helix to Helix
Running a stack train from Helix 1 to Helix 2. Up Helix 1 around upper level front mainline, then down Helix 2 along lower level back mainline up Helix 1 again
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Running a stack train from Helix 1 to Helix 2. Up Helix 1 around upper level front mainline, then down Helix 2 along lower level back mainline up Helix 1 again