The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
Answer:
Explanation:
Water shortages are a major threat globally but their impact is more severe in Africa in general and in Sub-Saharan Africa in particular. Including cholera outbreaks due to unhygienic sources of drinking water or poor crop yields due to scarce rainfall, the impact of drought on Africa is reported from Johannesburg Branch Office, Hitachi Europe Ltd.
Governor of Louisiana is John Bel Edwards
