The second part of the story is this. Every car is designed to a clearance diagram. If the material has changed, you cannot do much about it. If you made this one from plastic, you can't just.... You have to scrap it and make it from steel or aluminum or whatever. So that's number one.
The second one is the clearance diagram around it. The size, the geometry, is confined in a clearance diagram. If you want to change it to new rules and be out of this, you cannot do it. It's not just a matter of how much money you pay to retrofit. It's feasibility. Is it possible or not?
We put together a package for AAR, and we think a very small percentage of old tank cars that are in service are feasible for this retrofit.