Rewards: Pounds: 1980 (+125), EXP: 2500 (+150), Extra: Belt - Crossroad Belt
Challenges: 1. Free the station chief. 2. Use the secret passage.
Speak with the female Rook nearby the station to start this memory. Make you way to the eagle marker by climbing the station wall to the roof, dropping down on the metal beams via the open window. A scene will play, showing you the various opportunities in this mission. Don't feel overwhelmed, some of them are done easily after one another.
Start by dropping down and identify, then speak with the train conductor. He's missing the train schedules. Incidentally, you can find these close to where the station chief must be freed, which is on the upper part of the station to the left/northwest. Climb the nearby stairs (perhaps recruit the Rooks nearby, if you wish) and defeat the Blighters up ahead. You can take out the first with a cover assassination. Free the station chief and make your way to the back corner of this hall to collect the train schedule. Give them back to the conductor to achieve.. well, nothing much really.
Since you'll also want to complete the challenge, instead of moving with the crowd, turn around and head downstairs to the north. Move to the opposite side of the street and double assassinate the two Blighters here, then go down the stairs in the room behind them. Follow the passageway to the very end and lift up the manhole to complete the 'challenge'.
From here you can practically do whatever you want, but it's advisable to first defeat the nearby watcher on the train. Be sure to identify the security chief. He often walks on the upper walkway. When he's alone here, sneak up on him and steal the blueprints, then defeat him. You can now make your way to Pearl's fortified carriage in the back for the final, unique kill. Move to the end of the train afterwards to make your escape.