Train EB was applied while departing station in Auto mode. Released EB to no avail. TC operated DIRB S to move train in ATPM. Train EB was applied while departin g station in Auto mode. Released EB to no avail. TC operated ~~~~~ 633/634 3633 EB kept tripping in AM

1. Fault confirmed/Fault cannot be duplicated
Fault unable to be duplicated in depot.

2. What was found from ER/TIMS/Fault Trace
Train was in Auto Mode. ATS logs that 3633 EB due to obstructed motion. 

From LDC logs, Propulsion Enable Command (PEC) and Motoring Lines (ML) were  able to energise. ER show DIR and BRER able were energised.

Train was able to move off after TC change mode to ATPM after DIRBS activated.

Technically, activation of DIRBS was not required for train to move off.

3. Troubleshooting details

Probable Causal Factors
These are 3 identified causal factors based on FTA: 

A. Faulty AMR2 causing SR to be unable to energise
Likely
AMR-2/1 NO contact (for lines 1028/7025) high resistance (15ohm) when energised close.

SR may not have been energised resulting in train unable to propel despite propulsion command from VOBC.

B. DIR unable to energise
Unlikely
ER shows DIR was energised during time of fault. 

C. Brakes not released
Unlikely
ER shows BRER was energised. BCP for all cars ok.

4. Rectification
Replaced 3633 AMR2.

Further checks on 3633 SNR, TNR, CH4R and AMR1 satis.

Side Finding
Found 3633 SR NO contact (for lines 7005/7006) high resistance (4.9 ohms) when energised close.
Preventively replaced SR.

Both cab DIRBS checked and sealed.

We will be requesting MLT to verify train is able to propel in AM.