AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
1. Himalayan mountainous regions: Laying railway lines here is difficult due to high relief, steep gradients, and sparse population, which make construction expensive and complex.
2. Sandy plains of western Rajasthan / swamps of Gujarat / forested tracks of MP, Chhattisgarh, Odisha, Jharkhand: The unstable or densely forested terrain makes it difficult to lay and maintain stable railway tracks.
Source: Chapter 7, Railways section
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The passage explicitly lists several problem terrains — Himalayas (high relief), sandy Rajasthan, swamps of Gujarat, forested tracks of central India, and the Sahyadris. Pick any two and pair each with its stated reason. Examiners award 1 mark per correct terrain + reason pair. Avoid vague answers like "hilly areas" without naming the specific region mentioned in the text.