The other thing we have to pay attention to is the difference between legacy cars and this one. At the top you can see the big nozzle around those fittings. We call it rollover protection. If this car is derailed and is rolling, it's protecting the top portion. That's one of the changes.
The other one, which is very critical and important, is the material you use to build the tank. Based on this change, it's now TC-128, which is higher-resistance material: instead of 70 yield, it's 81 yield. The other one is the thickness; on the unjacketed they increased it to a minimum half-inch. If somebody wants to go more than that, they're welcome, but the minimum is half-inch TC-128, half head shield, and again, a half-inch thickness.
All of these things put together make the unjacketed tank car CPC-1232.