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1) constructing the moscow underground the workers encountered many difficulties. 2) the locomotive hauling trains on mountainous railways usually operate on electric energy. 3) having transmitters and receivers on the locomotives the driver is able to decrease and avoid the danger of train collisions. 4) each railway station has at least two tracks, those for the incoming and outgoing trains. 5) plastics being applied for the interior finishes of passenger cars greatly contribute to the reduction of maintenance costs. 1) создавая московский метрополитен, рабочие столкнулись с многочисленными трудностями.2) л окомотивы, т янущиепоезда на горных железных дорогах, как правило, работают на электрической энергии.3) имея передатчики и приемники на локомотиве, машинист может снизить и избежать опасность столкновения поездов.4) каждая железнодорожная станция имеет не менее двух путей для прибывающих и убывающих поездов.5) пластмассы, применяемые для внутренней отделки легковых автомобилей, существенно снизить затраты на техническое обслуживание.