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In a number of countries, some people think it is necessary to spend large sums of money on constructing new railway lines for very fast trains between cities. Others believe the money should be spent on improving existing public transport. Discuss both these views and give your own opinion.   Keywords railway lines for very fast trains: high-speed rail high-speed rail projects high-speed rail networks bullet trains   spend money on: devote money to allocate money to budget money for invest in investments in   construct: construction   improve: improvement upgrade upgradation   cities: urban centers   public transport: public buses and trains   Topic Specific Words go sightseeing the catering and accommodation sectors greenhouse gas emissions   car exhaust fumes the sustainable development of mankind