RVNL emerges as L1 bidder for ABS work on Madar-Sakhun rail section in Rajasthan February 8, 2023 | Awarded, Project Updates RVNL has emerged as the lowest (L1) bidder for provision of Automatic Block Signalling (ABS) System in Madar-Sakhun rail section in Rajasthan. This content is restricted.