The correct answer is: A. Samples & Seal Cards
Samples and seal cards are the only items that must be preserved and sent to DCM if a goods train catches fire. This is because they are the only items that can be used to identify the goods that were on the train. Without samples and seal cards, it would be very difficult to determine what goods were lost in the fire and who was responsible for them.
Samples are small pieces of goods that are taken from a larger shipment. They are used to test the quality of the goods and to ensure that they meet the requirements of the buyer. Seal cards are small cards that are attached to goods to show that they have been inspected and approved. They are also used to track the movement of goods and to prevent theft.
If a goods train catches fire, it is important to preserve the samples and seal cards so that they can be used to identify the goods that were on the train. This information can then be used to file a claim with the insurance company and to determine who was responsible for the loss of the goods.
The other options are incorrect because they do not need to be preserved and sent to DCM if a goods train catches fire. Non-samples are goods that are not used for testing or inspection. They do not need to be preserved because they are not necessary to identify the goods that were on the train.