New York’s Penn Station, the busiest station in the Americas, is a congested, uninviting, and dangerous underground complex. It needs to be transformed into an expansive and gracious hub for an expanding rail network. Current plans to expand the station complex with a new Moynihan Station across Eighth Avenue and Penn South — a terminus for the proposed Gateway tunnels — should be enlarged to create a unified complex with room for more people and trains, through-running service for both commuter and intercity rail service, and an inspiring design that brings in light and air and pedestrian spaces. Madison Square Garden will need to be relocated to improve security and bring light and air into the terminal.