train + brick connoisseurs, I have a question. this train head www.bluebrixx.com/en/prod/105660/railcar-white-red/ isn't supposed to be coupled with this passenger car? www.bluebrixx.com/en/prod/105659/passenger-car-white-red/
but one days it's 8w, and the other 6w. is the passenger car supposed to be coupled just to a locomotive?