70 Ton or 100 Ton Roller Bearing Trucks?

I don't know if it is just the angle of the picture but this area looks different.  The curve of the frame and the rivets.

Brendan

I agree with both of you that those are the same differences that I see and would say it’s a 100 ton truck.

Big difference is a 33” vs 36” wheel. But I suspect the 3 rail wheels are all the same.

If you have either a Maxi IV or an articulated auto carrier you can see the slight difference between the 70 ton and 100 ton trucks.  The auto carrier has 70 ton according to the Atlas website.  Those same trucks are the outboard trucks on the Maxi IV.  The inboard trucks are 100 ton.  All of the 70 ton I have show the word “Gould” on the left side of the frame in really small print.  The 100 ton side frames are slightly thicker right above the axel.  The 70 ton side frames have a small recess above the axel. The 100 ton have a small rib that protrudes in that area.  You can see that difference in the 2 pictures from Atlas.  Your original picture looks like a 100 ton.

I think the size of the wheel is one thing - as mentioned above.    100 ton trucks seem to have larger 36 inch wheels. vs 33 inch on most lighter cars.

A second thing you cannot see is the size of the bearings on the prototype.    I'm pretty sure the prototype 100 ton trucks had wider bearings - that is more surface for the axle to ride on.    The PRR did that when it converted X29 boxcars to express service in passenger trains.    It wasn't just for the weight which stayed the same, it was because of the higher speeds.    they also changed some things on the trucks.