Bob D,
Menard's has the 40' flat Cars covered also, I had to replace the original Menard's Trucks, but the Flat Car now runs great with the MTH Primer Trucks, and as a 40' it is darn near scale also. The Atlas Scale Insulated Box Car just behind the Menard's Military Tank Flat Car, shows the correct scale size. However to me as a non-rivet counter, I only care about the quality of the rolling stock not the exact scale size. Now that Menard's has upgraded their Trucks & Couplers, I keep investing in them, especially for my Military Train.
PCRR/Dave