Cab changing procedure in Electric Locomotives

A. CONVENTIONAL LOCO

i) Single Unit
1. Stop the Train / Loco.
2. Build up MR pressure up to 9.5 Kg/cm2 by closing BLCPD.
3. Keep SA-9 on application position; ensure 3.5 kg/cm2 pressure in BC gauge and the physical application of Loco brakes.
4. Keep A-9 on release position.
5. Close A-9 and SA-9 inlet and outlet COCS.
6. Close the cab doors and windows before going to other cab.
7. Switch OFF all auxiliary switches, open VCB, lower pantograph, put MPJ to '0',
lock BL and remove all loco keys. Proceed to other cab.
In other cab, (which is to be working as leading cab).
8. Keep SA-9 on application position and A-9 on release position.
9. Open A-9 and SA-9 inlet and outlet COCS.
10. Unlock BL, raise pantograph, close VCB and start auxiliaries.
11. Ensure proper function of SA-9 and A-9 after changing cabs every time.
12. Loco brake power test to be done before starting the Loco.
Note: On gradient section before leaving the cab, apply hand brakes of loco and apply wooden wedges.

ii) MU/Consist Unit
Driving Cab-
1. Stop the train/loco. Build up MR pressure 9.5 kg/cm2.
2. Keep SA-9 on application position and A-9 on Full-service position.
3. Ensure 3.5 kg/cm2 pressure in BC gauge and the physical application of Loco brakes.
4. Apply hand brake/ wooden wedges towards falling gradient.
5. Do not change any pneumatic COCs position.
6. Open VCB, switch off all auxiliary switches, lower pantograph, put MPJ to '0', lock BL and remove all the loco keys. Proceed to other loco.
In the other loco (which is to be working as leading loco):
7. Apply loco brake through SA-9 and keep A-9 in release position.
8. Open A-9 and SA-9 inlet & outlet COCs. Ensure BC gauge is showing 3.5 kg/cm2.
9. Put MU2B on 'LEAD' position, open BP charging LT (A-8) cock and open IP-cock.
10. Unlock BL, raise panto, close VCB, start auxiliaries.

Proceed to rear loco.
11. Change MU2B to 'TRAIL' position. Close L/T (A-8) cock, IP cock, inlet & outlet cocks of A-9 and SA-9. Keep A-9 on release position.
12. Close the cab doors and windows.
Then return to leading loco.
13. Check the working of A-9 and SA-9.
14. Release hand brake/ remove wooden wedges of trailing loco, if applied.
15. Before moving loco, conduct loco brake power test.

B. CAB CHANGING PROCEDURE IN 3-PHASE LOCOS:-

i) Single Unit (E-70 & CCB 2.0)
1. Stop the train/loco.
2. Apply Direct brake (SA-9) and ensure BC gauge is showing 3.5kg/cm2 (5.0 kg/cm2 in WAP-5 Loco).
3. Ensure MR pressure up to 10kg/cm2 (If required, hold BLCP in 'MAN' position).
4. Open 'VCB' and ensure LSDJ is glowing.
5. Lower the pantograph. Physically ensure it and 'U' meter should show '0'.
6. Move automatic brake (A-9) handle to Emergency position and ensure BP dropped. In E-70 Brake System - Put A-9 handle into 'Neutral' position and remove it.
In CCB 2.0 brake system -i) Move A-9 handle to FS & Lock it by locking pin. ii) Change the position of MODE switch from LEAD to TRAIL.
7. Operate BL key from 'D' to 'OFF' and remove it.
8. CE will remain ON in Self hold mode for 10mins. Parking brakes will apply (If provided).
9. Release SA-9 handle.
10. Close the doors and windows.

Go to the other cab.
11. Apply direct brake (SA-9).
In E-70 brake system - Insert A-9 handle in Neutral position and keep it in 'Run' position. In CCB 2.0 brake system-i) Change the MODE switch position from TRAIL to LEAD. ii) Unlock the A-9 handle and bring A-9 handle from FS position to RUN position after LCD display OK to RUN.
12. Operate BL key from 'OFF' to 'D'.
13. Raise pantograph and close VCB as per procedure.
14. Conduct loco brake power test.

ii) Multiple Unit (E-70 & CCB 2.0):
1. Stop the train/loco.
2. Apply Direct brake (SA-9) and ensure BC gauge is showing 3.5kg/cm2 (5.0 kg/cm2 in WAP-5 Loco).
3. Ensure MR pressure up to 10kg/cm2 (If required, hold BLCP in 'MAN' position).
4. Open 'VCB and ensure LSDJ is glowing.
5. Lower the pantograph. Physically ensure it and 'U' meter should show '0'.
6. Move automatic brake (A-9) handle to Emergency position and ensure BP dropped. In E-70 Brake System - Put A-9 handle into 'Neutral' position and remove it.
In CCB 2.0 brake system -i) Move A-9 handle to FS & Lock it by locking pin. ii) Change the position of MODE switch from LEAD to TRAIL 7. Keep feed pipe cock "136" in "Close" Position.
8. Operate BL key from 'D' to 'OFF' and remove it.
9. CE will remain ON in Self hold mode for 10mins. Parking brakes will apply (If provided). 10. Release SA-9 handle.
11. Close the doors and windows.

Proceed to the other Loco's leading cab
12. Apply direct brake (SA-9).
In E-70 brake system Insert A-9 handle in Neutral position and keep it in 'Run' position. In CCB 2.0 brake system -i) Change the MODE switch position from TRAIL to LEAD. i) Unlock the A-9 handle and bring A-9 handle from FS position to RUN position after LCD display OK to RUN.
13. Operate BL key from 'OFF' to 'D'.
14. Raise pantograph and close VCB as per procedure. 15. Keep feed pipe cock "136" in "Open" position. 16. Conduct loco brake power test.