CheatCodes.com has all the official A-Train PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Friday May 24, 2013 for A-Train are shown below.
At the title screen, press L1 + L2 + R1 + R2, then press Square + Triangle + Start. The map selection screen will be displayed. Now hold L1 + L2 + R1 + R2 and press Circle. If you entered the code correctly, you will hear a sound. Then, pause the game and press Left, Right, Up, or Down to gain more money.
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