Once this is done, leeches will attack Rebecca and knock
her into a room where she will be trapped. As Billy, go back into the
Dining Car.
Dining Car (2nd floor) (Billy)
------------------------------
Go downstairs.
Dining Car (1st floor) (Billy)
------------------------------
Go through the automatic door now that power is restored and turn the
corner. Switch to Rebecca and send down all her ammo via service
elevator. Also, send down the Train Key (Conductor Key) and the Green
Herb. Now switch back to Billy and proceed to the main car.
Main Car (Billy)
----------------
Go through the door at the end and watch out for the zombies.
Stairway Car (Billy)
--------------------
Watch the zombies roaming around and go through the door at the end.
Cabin Car (Billy)
-----------------
Go to the end of the car and use the Conductor's Key to unlock the
door.
Conductor's Room (Billy)
------------------------
Take the Train Map on the wall. Go to the cabinet next to the desk and
take the Briefcase. Stock up on health, take the file on the floor,
then press the button next to the door to let out a ladder. Climb
up...
Lounge Car (Billy)
------------------
As you make your way across this large room, a cut-scene will play.
Don't worry, nothing will happen, yet... Go through the door at the
end of the room.
2nd Story Car (Billy)
---------------------
Pick up the Ice Pick on the dining shelf and go down the hallway into
the door on your right.
Closet Room (Billy)
-------------------
Ah yes, plenty of goodies in here. Pick up the Hunting Gun on the bed
and the shells at the foot of the bed. Also take the First-Aid Spray
(you may very well need it) Now leave.
2nd Story Car (Billy)
---------------------
Backtrack to the Lounge Car.
Lounge Car (Billy)
------------------
Proceed forward a little bit, and then watch as the first boss of the
game makes its entrance. (Look at the boss section to see how to fight
this boss) After the easy battle, run to the wreck at the end and take
the Panel Opener. Now go down the ladder.
Conductor's Room (Billy)
------------------------
From here, backtrack all the way back to the Dining Car (1st floor)
Dining Car (1st floor) (Billy)
------------------------------
Go to the service elevator and send Rebecca the Ice Pick. Switch back
to Rebecca and use the Ice Pick on the door to release the doorknob.
Exit the room.
Источник:
http://db.gamefaqs.com/console/gamecube/file/resident_evil_zero_f.txt
А если вкратце, то дай Билли ключ Conductor Key, используй его в первом вагоне слева (по карте), ...... возьми Ice Pick, убей босса, вернись к Ребеке отдай ей Ice Pick, чтобы она открыла дверь.