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Main Line Flint Subdivision - GTW - Port Huron to Battle Creek
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Main Line South Bend Sub - GTW - Battle Creek to Chicago
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Cass City Sub - GTW - Pontiac Yard to Caseville
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Grand Haven Sub - GTW - Durand to Grand Haven
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Holly Sub - GTW - Detroit to Durand
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Jackson Branch - GTW - MAL Junction to Jackson
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Kalamazoo Sub - GTW - Pavilion to Kalamazoo
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Mount Clemens Sub - GTW - West Detroit to Tappen (Port Huron)
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Muskegon Sub - GTW - Ashley to Muskegon
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Pontiac Belt Line - GTW - Around Pontiac
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Romeo Sub - GTW - Richmond to Pontiac
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Saginaw Sub - GTW - Durand to Bay City
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