Mumbai, Jan. 3 -- Dense fog conditions in north India continue to disrupt long-distance rail services, triggering a cascading impact on Mumbai's suburban train network. On average, 30 to 40 long-distance trains on the Central Railway (CR) are arriving more than 30 minutes late each day, with some services delayed by as much as 500 minutes. According to railway officials, the late arrivals are severely affecting the schedules and movement of local trains, particularly during peak rush hours, as delayed express services occupy track paths meant for suburban operations. As a result, schedules of express trains arriving in and departing from Mumbai have been thrown out of gear. During the morning and evening rush hours, over 42 express trains have been arriving late, forcing local services to run 15 to 20 minutes behind schedule, with a few being cancelled. Railway officials said the situation has led to frequent track changes, especially on the busy Kalyan-Thane stretch. Earlier this week, the Madgaon Express reached Mumbai nearly six hours behind schedule. "These delays are beyond our control and have a direct impact on local train services during peak hours," a CR official said....