If you are referring to the Galloping Ghost Arcade out in Brookfield be aware that the CTA green line will not get you there. The Metra BNSF commuter rail line will get you out there, and it is shown as green on some transit maps, but is never referred to as the green line by locals. Make sure you end up on the correct train line and system. The closest station to the arcade, Congress Park, sees infrequent weekday service and none on the weekends, but the Brookfield stop, roughly a mile away sees decent service. Apologies for the slim BA connection of this post.