I think that is a Rube Goldberg idea. They’ve taken two reasonable ideas, regenerative braking and carbon capture and melded them together on a moving platform

I think that is a Rube Goldberg idea. They’ve taken two reasonable ideas, regenerative braking and carbon capture and melded them together on a moving platform where it makes no sense. Some of the problems: 1) The diesel train will emit much more carbon than captured so you are dependent on carbon emissions for your carbon capture. 2) The fans will slow the train speed. 3) The weight of the carbon capture car will increase the train’s load and hence the carbon usage of the train AND it will get heavier as you capture more and more carbon. New diesel passenger trains are able to use regenerative braking to power auxiliary loads (heating cooling &lights), this wouldn’t really work with freight trains unless you were moving something that has to stay refrigerated.