London's Tube network is facing severe disruption as members of the Rail, Maritime and Transport union (RMT) have initiated a strike over proposed changes to working hours. The strike began at noon today and is expected to last for 24 hours, with another strike planned for Thursday. This action is projected to cost the economy around £250 million. The RMT opposes Transport for London's (TfL) proposal for a four-day working week, arguing that it could lead to increased fatigue and safety concerns among drivers. Major lines, including the Piccadilly and Circle lines, will be shut down, while other lines will operate at reduced capacity. Commuters are advised to seek alternative transportation methods, with many expected to walk, cycle, or work from home. The hospitality sector is bracing for a significant decline in bookings, with estimates suggesting a drop of up to 67%. TfL maintains that the changes are voluntary and necessary to align with other train operating companies, urging the RMT to reconsider the strike. The situation highlights ongoing tensions between union demands and operational changes within London's transport system.