Listen to another conversation with Captain Gordon and go towards the South-eastern exit from the train station. After you reach the locked door, use the shock gloves, to unlock access to the Maintenance Corridor (South). Walk under the big pipes and explode the explosive gel at the weakened wall fragment. This action will coincide with a bigger explosion that will damage a large portion of the bridge
Start by turning towards the nearest car that has been knocked over, thanks to which you will be able to gain access inside that car, using the hook. Walk through the car, turn left and jump towards the small element of the bridge. Then, use the grapple in the spot shown in the screenshot.
Wait until the rope extends and glide towards it. Turn right and walk to the ropes very end. Look up and locate the interactive ledge that you can use the hook on. Repeat this action on the second ledge, reach the region of a bigger platform. Start by surprise-attacking the sniper here.
Use the hook to reach the nearby vantage point and note that there are two more snipers in this area. Wait for the enemies to disperse and get each one from behind to perform the quiet takedown, starting, of course, with the one standing nearer the Batman. Note - if you do not want to take too much risk, you can, after having neutralized the first sniper, return to the vantage point and wait for the right moment to attack the second one. You can now take the door to the South Pillar Electrical Room.
Jump into the venting shaft, walk over to its other end and start another, bigger fight with surprise-attacking the enemy standing the closest to the venting shaft. After the fights proper start, remember that you still need to avoid direct attacks on the enemy carrying a stun gun.
While fighting, you should notice that it is surrounded by metal elements with electricity flowing through them. Therefore, you should not allow yourself to be pushed off the arena's edge but, on the other hand, you can try pushing them there yourself so that they are shocked with electricity and lose their health. As far as the bandits' gear is concerned, just like usually, you should focus on the enemies with guns and on using the cape, or the shock gloves against the enemies with shields.
After you won the fight, examine the arena's corners to find there the power supply button. You can now open the metal gate, remove the third bomb's casing and use the Cryptographic Sequencer. Just like earlier, you will have to guess three passwords shown in the screenshot and, just like earlier, there is a time limit to determine each one of them (21, 19 and 17 seconds).
[New challenge: Combat Training]