sentences:  The severe climate and mountain terrain along the line are a challenge.Within a few years of construction, sleet buildups of as much a 6 inches (15 cm) had been observed on wires along the line.Several towers were buckled and demolished by wind force alone—wind speeds of over 165 miles per hour (265 km/h) were measured at one point along the line, leading to metal fatigue at the points where insulators support the power line.