Two versions of this truck were made by IVES. The first was made from 1925-27 and was used on the deluxe 180 181 182 cars. These can show up with all 6 wheels, or sometimes with just 4 per truck. Our best guess is cost cutting measures in 1927. These trucks used a fiber roller pick up and standard mounting.
The second truck, reworked to use the smaller journals also added a spreader bar. Although some early 1928 180 series cars did not have one, but they are very rare. This truck used snake pull mounting and was made from 1928-30. It came on the large American Flyer and Lionel bodied cars in the "Occupation" years. They also came in red when used on a Black Diamond, or Chief car.