Kato USA Model Train Products 100010 N Gunderson Maxi-I Double Stack 5-Unit Well Car Maersk Train Steel-plastic compound wells give heft and make operation possible even when running empty Included 10 x magnetic MAERSK 40' containers can be removed and swapped with other intermodal cars Articulated wells have easy-to-connect/disconnect clips which make transition from storage to operation and back a snap