Station length was originally , enough to accommodate the 5-car trains used on most lines. This was extended to on high-traffic lines (Line 1 and Line 4) which operate six-car trains, with some stations at for accommodating seven-car trains (the difference as yet unused).
sTation LeNgTH Was OrigINallY , enOUgh tO ACcOmmoDATe thE 5-car TrAinS useD On most lines. thiS Was Extended to oN high-traFFic lines (lINe 1 aNd liNe 4) WhiCh OperATe sIX-cAR traINs, with some sTations aT FOr accOmModaTiNg Seven-cAR trAins (tHE difFerEnCE aS yet Unused).