The Train Wheel Gauge (The Distance Between Rails on a Train

Multiple Choice

The train wheel gauge (the distance between rails on a train track) is different in Mongolia than in Russia. When a train travels from one country into the other, the wheels on each train car must be changed at the border to allow the train to fit onto the track across the border in the other country. This situation indicates that

A) interconnection of essential facilities is immediate and automatic.
B) essential facilities are common, but interconnection is possible only at a great cost.
C) interconnection of essential facilities is possible across the railway networks, but only with some inefficiency.
D) interconnection of essential facilities is not possible with the technologies used.