Efficiency Analysis of Underframe Component Installation Process in the KCI Retrofit Electric Multiple Unit (EMU) Project at PT Xxx Using a Lean Manufacturing Approach: Analisis Efisiensi Proses Pemasangan Komponen Underframe Pada Proyek KRL KCI Retrofit Di PT Xxx Dengan Pendekatan Lean Manufacturing. PELS 2026, 10 (1), 1289-1297. https://doi.org/10.21070/44edbd30.