Kolkata Metro Railway will increase services on the Blue and Green Lines for four Sundays until January 25. The Blue Line will see 160 services instead of 130, with slight adjustments to the last train's departure time. The Green Line will operate 124 services instead of 108. Both lines will have reduced service intervals during peak afternoon and evening hours on these Sundays. Services on the Orange and Purple Lines will remain suspended, while the Yellow Line will operate as usual.