What action should a train dispatcher take upon receiving a severe weather warning?

When a train dispatcher receives a severe weather warning, it is crucial to prioritize safety and ensure effective communication with all trains operating in the affected area. Contacting all trains in the affected area allows the dispatcher to inform them of the potential dangers and provide instructions on how to proceed safely. This proactive approach helps in coordinating responses, altering routes, or implementing speed restrictions if necessary to mitigate risks associated with severe weather conditions.

This action not only enhances the safety of train operations but also helps maintain situational awareness for all crew members involved. It ensures that the dispatcher's response is comprehensive and includes all relevant parties, which is essential during severe weather events when conditions can change rapidly.