Following on completion of the Phase 1 improvements of the Northern Line, a short-term project (P12-S1, ongoing basic improvements), Northern Line Railway Improvement Project (Phase 2) (P12-M1) entails further improvements on the northern line. The project has been implemented by the Department of Railways, MPWT. By the 3rd quarter of 2021, the project achieved 40% of overall progress. In fact, the main activities under this project are as follows:

1. Conduct feasibility and design studies achieved 30%
2. Implement cost-effective project components, e.g., more crossing loops, signaling improvements, motorized points, track circuiting, and electric level crossings on the road in Phase 2 achieved 30%
3. Implement social and environmental impact mitigation measures achieved 60%