Final answer:
Notifying the Fire Department after a subway employee extinguishes a fire is crucial to verify the absence of further hazards, confirm complete extinguishment, and ensure public safety, as the Fire Department's responsibilities extend beyond immediate firefighting.
Step-by-step explanation:
The probable reason for notifying the Fire Department even when a fire has been extinguished by a subway employee is to ensure that there are no remaining hazards and to confirm the fire has been completely put out. After all, the Fire Department's role includes not just combating fires but also protecting life and property, conducting rescue efforts, and managing any potential dangers that may not be apparent immediately after a fire is extinguished. For instance, there might still be risks such as structural damage, smoldering embers that could reignite, or harmful fumes that continue to pose a health risk.
Furthermore, fire services are funded through the general tax base, providing these essential services without requiring direct payment from the individuals in need. This is part of the government's responsibility to ensure public safety, which is why even seemingly minor incidents should be inspected by professionals to prevent any further issues.