Narrow gauge railways in India

We don't know which railway these photos were taken on. Can you help us classify them?

• Darjeeling Himalayan Railway (12 images)
• Indian metre gauge railways (3 images)
• Motipur Sugar Mill (3 images)
• Nilgiri Railway (8 images)
• Riga sugar mill (4 images)
• Shimla Railway (3 images)
• Tipong Colliery (7 images)