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Option 1: Repairing and reusing old wagons. This option suggests that Indian Railways solves the problem of shortage of railway wagons by repairing and reusing old wagons. This can be a cost-effective solution as it eliminates the need to purchase new wagons. However, it may not completely solve the problem of shortage if the demand for transporting bulk goods on a large scale exceeds the availability of old wagons.
Option 2: Increasing the production capacity of wagon manufacturers. This option proposes that Indian Railways resolves the shortage of railway wagons by increasing the production capacity of wagon manufacturers. By doing so, more wagons can be produced to meet the demand. This can be an effective solution if the existing production capacity is the bottleneck causing the shortage.
Option 3: Importing railway wagons from abroad. This option suggests that Indian Railways solves the problem by importing railway wagons from other countries. This can be a viable solution if there are no restrictions or limitations on importing wagons and if it is more cost-effective compared to producing or repairing wagons locally.
Option 4: Supply of wagons by consumers who had bought them from identified wagon manufacturers. This is the correct answer provided. It implies that Indian Railways is able to overcome the shortage