Which restraint option is considered the best for providing forward restraint for a 15,000-pound piece of rolling stock?

The best restraint option for providing forward restraint for a 15,000-pound piece of rolling stock is two MB-2s. This choice is optimal because the MB-2 is specifically designed to handle larger and heavier loads compared to the MB-1. Each MB-2 has a high strength rating, making them suitable for securing substantial weights effectively. When securing a load of this magnitude, ensuring that the restraint system is robust and can withstand the forces experienced during transport is crucial.

Using two MB-2s increases the safety factor, as the combined strength of the two devices provides a greater margin of security against movement and potential damage during transit. This is particularly important with rolling stock, which can shift more easily due to its mobility. Moreover, the design of the MB-2 allows for a better fit and more effective engagement with the load, further enhancing the reliability of the restraint.

In contrast, using the MB-1 might not provide adequate strength for such a heavy load, either in a single unit or multiple units. Therefore, selecting two MB-2s is the most effective approach for ensuring the forward restraint of a rolling stock weighing 15,000 pounds.