Electric railways in Indiana Interurban railways in Illinois Interurban railways in Indiana Passenger rail transportation in Illinois Passenger rail transportation in Indiana Railway lines in Chicago Railway services introduced in 1903 Standard gauge railways in the United States Transportation in Gary, Indiana Transportation in LaPorte County, Indiana Transportation in Porter County, Indiana Transportation in South Bend, Indiana Commuter rail in the United States 1500 V DC railway electrification Airport rail links in the United States