Primary Spring (Inner) for LHB Non-AC Coaches to RCF Drg. No. LG 01101, Alt. b and conforming to RDSO Spec. No. RDSO/2017/CG-01, Rev. 03 of January 2025 along with RDSO L. No. SV.FIAT.Spring, Dated 11/13.06.2019. Spring Code No. F06. Spec: