The Enterprise train, which provides the flagship intercity service between Dublin Connolly and Belfast Grand Central, operates at a maximum speed of 90 mph (145 km/h). While the modern rolling stock is technically capable of higher speeds, the current infrastructure of the cross-border line limits the journey to this threshold. In 2026, the average travel time for the 112-mile (181 km) trip is approximately 2 hours and 10 minutes to 2 hours and 15 minutes, with trains now running on an improved hourly schedule. There are ongoing government initiatives in both Ireland and Northern Ireland to upgrade the track and signaling to allow for 100-125 mph operations in the future, which would ideally reduce the journey to under 90 minutes. For now, the Enterprise remains a comfortable and scenic "mid-speed" rail link, offering a "First Plus" class with full dining service that makes it a popular alternative to the M1 motorway for business and leisure travelers alike.