RVNL receives LoA for ABS work on Madar-Sakhun rail section in Rajasthan April 13, 2023 | Awarded, Project Updates RVNL received LoA for a contract worth Rs 630.83 million for the provision of Automatic Block Signalling system in Madar-Sakhun rail section on April 12, 2023. This content is restricted.