A few years ago Atlas O produced the Coil Steel Cars in O scale.
This may have been reviewed on here before but I have to do my take on them.
Atlas's coil steel cars are based off of the National Steel Car prototype. National Steel Car built two types or sizes of the coil steel car. The first size/type is a 48' design. The second size/type is a 42' design. After examining the pictures of the 42' coil steel car and comparing the prototype to the Atlas O scale model, I have to say Atlas did a fantastic job on accuracy and detail.
I give Atlas a grade of A or at least 5 stars.
The good and the bad.
Bad:
1. coupler height is off by 3 or 4mm compared to the Kadee coupler height gauge.
2. weight is a little on the light side. I need the NMRA scale to measure the correct weight for this car.
Good:
1. All details are fine and prototypical.
2. the hood is removable.
3. the walkways are see through. Walkways are plastic but look like metal.
4. All printing is crisp, clear and easy to read.
5. All railings are separately applied.
6. End stirrups/steps are prototypical in thickness.
7. There are 4 removable coils that are made of plastic.
8. Coupler cut lever bar
9. Grab irons are separately applied and made of metal.
I recently bought a second coil steel car and plan on buying a third. I believe the weight could be improved if Atlas used real metal for the coils or made the underside of the car mostly metal as they have done with their tank cars. These coil steel cars are highly recommended for any modern freight train enthusiast.