railway system without dependence upon imported fuel.
271- It is pointed out in the passage that the benefits of electric railway reaction --.
A) cover a cleaner environment and an improved performance
B) are confined to mountainous areas
C) do not outweigh the problems involved
D) have only recently become apparent
E) can best be seen in Sweden
272- The author states that on mountainous lines the track capacity is improved by electrification --------.
A) and the safety aspect is causing much concern
B) however, upkeep expenses are high
C) as it enables trains to go faster both up and down the line
D) yet, this is not the case in other locations
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E) unless electric forms of breaking are used
273- In the passage, it maintained that Sweden and Switzerland have one of the