EB applied departing station with obstruction motion detected. Unable to proceed in Auto mode. Proce eded in ATPM mode to subsequent stations.nged at AMK. Replacement train from BSD. ~~~~~ No FC. From LDC logs, 3506 was leading cab, 3505 was VOBC active cab and train was unable to propel in AM mode causing EB due to obstructed motion 4 times. From LDC, ML1,2,3 avail, PEC avail and BDC avail. From ER, DIR was ok and brakes can be released but P1-P4 not avail causing propulsion not to kick in. Train EB after 9 seconds as motoring command was given and train did not propel. SDIR dropped everytime motoring command was give at 3506 in AM mode but 3505 SDIR was up. Train was able to propel in ATPM. In depot checked SNR unable to energize with 110VDC supply to the coil. Found LGD01 with floating voltage of 50V compared to the ground of the TLSK. WFRa and TNR were also unable to energize as a result. This explained why SDIR unable to energize too from ER. Checked CN-4 which is related to the line powering the SNR and confirmed pin condition was okay with no foreign particles. Unplug and plug back inand measured and found no floating voltage at LGD01. Checked SR 1-2, AMR 1-2 for both 3506 and 3505. Found SR-2 high resistance (5ohms) when energized between contact 7029-7030. which self-holds the energization for SR 1-2. Proceeded to preventively c/o SR 2 and requested for MLT. MLT passed with no abnormalities and P1-P4 avail during propulsion in AM mode for both cabs. Done by: Luke and Ashwin