Why was the demand for durable timber for railway sleepers more serious than ordinary timber use?

Correct answer: It required large scale regular and strong timber

The direct answer is D: it required large-scale, regular supplies of strong and durable timber. Ordinary local use usually involved limited needs such as fuel, tools, small buildings or household repairs. Railway construction was different because every railway line needed many sleepers, the heavy wooden supports placed under the rails. These sleepers had to resist weight, pressure, weather and repeated movement, so weak or quickly decaying wood was unsuitable. Step by step: railways expanded; each new track required sleepers; sleepers had to be strong and durable; expansion created a continuing demand for large quantities; therefore railway timber demand caused much greater pressure on forests. Option A is wrong because the demand was not limited to house repair; it served a rapidly expanding transport network. Option B is wrong because it was not merely a small local need: railway companies and colonial authorities required timber on a large scale. Option C is wrong because cutting forests for sleepers was an extraction policy, not a forest-protection policy. Option D is correct because it includes both important clues—large scale and regular supply—and also explains why the wood had to be strong. The exam cue is “railway sleepers = many tracks + repeated demand + durable wood.” Do not judge the impact by the size of one sleeper; judge it by the huge number needed across the railway network.