Concept:Rail transport is ideal for moving large volumes of heavy and bulky goods over long distances.
Explanation:Railways have a high carrying capacity, making them suitable for bulky and heavy goods.
Maintenance of rail infrastructure is costly, so it is not less expensive to maintain.
Rail services can face delays due to weather, signal failures, or traffic congestion.
Rail transport does not offer door-to-door delivery because goods must be loaded and unloaded at stations.
Thus, the key advantage is the ability to carry bulky and heavy goods efficiently.
Answer:C. bulky and heavy goods