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When hauling Division 4.3 materials, which are classified as environmentally hazardous substances, it is crucial to ensure safety while approaching a railroad-highway crossing. The correct action in this scenario is to stop and check for trains. This requirement is in place to prevent accidents due to the potential presence of trains, which can pose a significant danger.

Stopping allows the driver to take the necessary precautions to observe the tracks for any incoming trains. This step is particularly important given that Division 4.3 materials can pose unique risks, including their ability to produce flammable gases when in contact with water, further emphasizing the importance of vigilance at crossings.

The other options do not promote safety or compliance with regulations. While notifying the railroad company may be considered in other contexts, it is not a mandatory action before crossing. Speeding through a crossing is inherently dangerous and ignores the need for caution. Continuing without stopping completely disregards the inherent risks associated with rail crossings and the specific hazards of the materials being transported.