Modes of Transportation
- The principal modes of world transportation are land, water, air, and pipelines.
- The significance of a mode depends on the type of goods and services to be transported, the costs of transport and the mode available.

Railway Gauges
- Based on the width of the track of the Indian Railways, three categories have been made:
- Broad gauge: The distance between rails is 1.676 metres. It accounts for 74.14 per cent of the length of rail routes in the country.
- Metre gauge: The distance between rails is one metre. It accounts for 21.02 per cent of the length of rail routes in the country.
- Narrow gauge: The distance between the rails is 0.762 metres or 0.610 metres. It accounts for 4.94 per cent of the length of rail routes in the country.
Broad gauge (74%) > Meter gauge (21%) > Narrow gauge (5%)
Operating Ratio
- It is the ratio of ordinary working expenses to the gross traffic receipts.
- A lower ratio implies better profitability and surplus for capital investment.
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