Amsterdam metro lines get new numbering: no longer 50 to 54, but simply M1 to M4

Starting in December 2027, the Amsterdam metro system will transition from its current 50-series numbering to a simplified system featuring lines M1 through M4. The Noord/Zuidlijn will become M1, the current M51 will be renamed M2, the combined M50 and M53 lines will operate as M3, and the former M54 line will become M4. Along with new numbering, metro line colors will be adjusted to improve accessibility for visually impaired and colorblind passengers. This change aims to simplify navigation for tourists and residents while aligning the metro with national train service standards scheduled for the same year.

The implementation coincides with broader infrastructure upgrades, including increased frequency in the central tunnel and the merging of specific routes. While these changes are intended to streamline the network, they have prompted concerns among residents in Amsterdam Zuidoost regarding the loss of direct city center connections. To address these issues, the Vervoerregio plans to introduce additional support measures, such as enhanced security at transfer stations, to ensure a smoother transition for commuters.