AN ACR MLG TAXIED ACROSS AN 'ISLAND' AT ORD.

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DEP WERE DELAYED BY A PASSING TSTM. TXWYS WERE CONGESTED. OUR INSTRUCTIONS WERE SIMPLY TO FOLLOW THE PRECEDING 737. IT WAS NIGHT AND VISION WAS SOMEWHAT RESTR BY RAIN. THE 737 AHEAD; AND PERHAPS OTHERS IN FRONT OF HIM; TAXIED NE THROUGH THE ISLAND BOUNDED BY A; B; A-18; AND A-19. THIS ISLAND IS LOAD-BEARING AND SURROUNDED BY RAISED BLUE TXWY LIGHTS. THE WIDTH OF THE ISLAND IS NEARLY THE SAME AS A TXWY AND THE BLUE LIGHTS ON THE S SIDE OF THE ISLAND ARE VERY FAR APART. GLARE FROM THE INTL RAMP LIGHT FIXTURES ON THE WET CONCRETE MADE IT IMPOSSIBLE TO SEE THE YELLOW TAXI LINES. WHAT I MISTOOK FOR THE YELLOW TAXI LINE; MUST HAVE BEEN THE NOSE GEAR TRACK OF THE PRECEDING ACFT. WE FOLLOWED THE OTHER ACFT THROUGH THE ISLAND WITHOUT CONTACT WITH ANY TXWY LIGHTS. BOTH MY FO AND I HAD THE ILLUSION THAT WE WERE ON A TXWY. EVEN WITH THE DARK; RAIN; AND GLARE; IF THE BLUE TXWY LIGHTS ON THE S SIDE OF THE ISLAND WERE CLOSER TOGETHER; IT WOULD HAVE BEEN OBVIOUS THAT THIS WAS AN ISLAND AND NOT A TXWY.