Thanks for the kind comments, guys.
The figures shown in my post above are a mixture of 1:48 "Passengers" and "People Sitting" from Woodland Scenics (expensive), 1:48 and 1:50 O Scale Seated Figures assortments from China (less expensive and cheap), and the original GGD figures included with the cars. Many have been modified and repainted to camouflage the inevitable duplication.
The WS figures are way to costly (and heavy) to populate the train, so I just use them in the high visibility domes and obs end. The Chinese figures are available on e.Bay, and I
received mine within 2 weeks or ordering. The 1:50 figures are identical to the ones used by Terry Danks and shown in his original post. They are an easier fit, especially in the tighter spaces of the GGD car interiors. Like Terry, I too need a lot of passengers, and I'm looking for new sources.
Crank