An interurban is a type of electric passenger railroad; in short a hybrid between streetcar and train.
In Michigan interurbans were particularly popular, and the largest cities of West Michigan were connected by interurbans before their demise in the twenties and thirties.
Allegan to Battle Creek
Grand Rapids to Holland
(Grand Rapids, Holland & Chicago)
Grand Rapids to Kalamazoo
Grand Rapids to Muskegon
(Grand Rapids, Grand Haven & Muskegon)
Kalamazoo to Grand Rapids
See Grand Rapids to Kalamazoo
Kalamazoo to Jackson
Lansing to Jackson
Lansing to St. Johns
Lansing to Owosso/Corunna
(Lists of stations were read off of the SPV Railroad Atlas of North America volume Great Lakes East.)