HELP !! can anyone help me identify these cars, i purchased 6 Union Pacific diner  cars from an estate auction recently they have 4 wheel trucks with very long couplers, the window glass & roof come off as one piece, there are no identifying marks or numbers any where . they are yellow W/ gray roof and car# is 328  on all of them. when placed on track& coupled the cars are almost 1 1/2 inches apart and lean to the side then then fall over! what is wrong? wrong trucks&couplers?