Fog reduces visibility, making it difficult for train drivers to see signals and track conditions. This can lead to delays, cancellations, or rescheduling of train services. According to the India Meteorological Department (IMD), the fog season typically lasts from mid-December to mid-February, coinciding with peak travel times like Chhath Puja and winter vacations. The Civil Aviation Ministry has also highlighted the importance of operational readiness during this period, which applies to railways as well.