The sustained productivity growth of railroads occurred primarily because of:
A) increased economies of scale.
B) more powerful locomotives and more efficient freight cars.
C) stronger steel rails.
D) the advent of refrigerator cars.

Question

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The Answer of The sustained productivity growth of railroads occurred primarily because of:
A) increased economies of scale.
B) more powerful locomotives and more efficient freight cars.
C) stronger steel rails.
D) the advent of refrigerator cars.

The Sustained Productivity Growth of Railroads Occurred Primarily Because Of