Tenders for Supply Of Microprocessor Based Energy Cum Speed Monitoring Unit For 3-phase Electric Locomotive As Per Rdso Specification No. Elrs/spec/ Spm/0002 Rev-04 July 2018. Without Mounting Accessories. Each Set Consists Of The Following Items: 1 Speed Recording Unit Master - 01 No. 2 Speed Indicating Unit Slave - 01 No. 3 Pulse Generator Speed Sensor - 01 No.