Many thanks for input. My fist summer project can now get underway.

Heavyweight

Recently, I acquired several pieces of older HO Bachmann Spectrum passenger equipment including locomotives and passenger cars. These are used. All are in good shape. All are working. And, all were still in original packaging. I am looking for recommendation on upgrading couplers, trucks and wheelsets. All are DC, and I will not be upgrading to DCC at this time. I have 1 Doodlebug, and 1 each F7A and F7B. Both powered. The are 2 observation cars, and 1 each of coach, diner and combine. These all have X2F couplers and plastic trucks and wheelsets. No interior lighting. These will operate on a modular club layout used for public displays. The club uses 30" curves, and # 6 turnouts. Any help in choosing better couplers, trucks and wheelsets would be appreciated.