Any 50T Roller-bearing trucks in N-scale?

[nickelplate759]

In research which trucks the NKP applied to which freight cars in the 1950s and 1960s, I've found a some 50T cars that had roller-bearing trucks.  Same is true for other roads.   Although the equipment diagrams don't usually indicate whether it is a 50T or 70T truck, I suspect that most such  cars didn't get unnecessary 70T trucks.     There are HO models of ASF A3 Ride-control 50T trucks from Tangent and Moloco (maybe others); is anyone aware of any 50T roller-bearing N-scale freight truck models?

It's possible that the original Micro-Trains roller-bearing truck might be a 50T truck (it has the right wheelbase), but no one seems to know what the prototype really is [ edit - Spookshow site suggests it's a Symington-Gould ].  It doesn't look like an ASF A3

[jagged ben]

I'm fairly positive no such item has been mass produced in N scale.

I'm curious what proto rolling stock you're finding these on and what info you have about the wheelbase.  I'm modeling an ATSF 10-pack fuel foiler which had trucks with 5'-0" wheelbases and 28" wheels, but I don't have any info on the make or ton rating.  I'm going with the MT truck for now, although I might design and print a new truck in the future.  I did find that that the MT wheelbase seems to be a few scale inches less than the BLMA or ESM 70-ton ASF trucks.  But it's still closer to 6' than 5' iirc. 

Curious what the wheelbase on the Tangent HO truck is. 

[Lemosteam]

If someone can find a proto image, I can take my recent ASF A-3 50t trucks and convert them to Roller bearings easily enough.