This cache is not at the posted coordinates, though you must visit them to locate the cache. Be glad I didn't make this an in-theme music puzzle about a pop-soul sibling duo whose work I've been getting into recently.
I love the Lawrence Caltrain station! I've been visting often recently for my COTD, and today I decided I needed to mark it with an official station cache, and maybe continue the mini-series at other Caltrain stations (or encourage others to do so, hint hint).
When you reach the posted coordinates, you'll be at the north side of the underpass beneath the tracks. Head up the steps on the NB side, counting the number of stairs until you reach the platform. Multiply that number by two, then subtract three. Call this number AB.
Keep walking in the same direction until you reach a Caltrain parking lot, then locate parking spot #AB. The cache is magnetic between here and spot #A(B-1).
Congrats to Cats4us on FTF, less than 20 minutes post-publication!