The majority of Pullman heavyweight passenger cars rode on standard 2410 6 wheel trucks, and consequently that design has been offered by a number of O scale manufacturers. However a reasonable number of heavyweight Pullmans were equipped with Pullman 242 trucks. They are distinguished by not having drop equalizer bars between the truck journals. The P-Company's O scale brass model of PRR's Queen Mary came with 242 trucks - but they were not offered for separate sale.
(I rebuilt the roof - Lee Turner beautifully finished the car)
The next heavyweight Pullman I'd like model is PRR's Keystone Banks. To do it right I'll need a pair of 242 trucks. Does anyone know a source for them in O scale?