We know that the main problem of our climate is the excessive amount of CO2 that we have, and in addition to avoiding the generation of additional CO2, the possibility of reducing part of the CO2 that we already have is very important.
But at present, the removal of CO2 requires complex and expensive installations. It is estimated that eliminating a ton of CO2 has a cost of over 100 dollars.
There are many people doing research in this field, and recently I have seen the proposal of an American company called CO2 Rail , which proposes to remove CO2 from the atmosphere using train cars. Just as it sounds, train cars that can be placed on any of the thousands of trains that travel around the world at all times.
The folks at CO2 Rail estimate that each railcar can remove up to 15 tons of CO2 per day, and their railcars also have an electrical regeneration system during braking. The CO2 stored in the tanks during the trip is discharged to a larger deposit when arriving at a station.
As the train also moves, the wagon does not need the fans of the fixed stations to circulate the air. This enters directly by the movement of the train during the march.
The system seems simple, does not require large fixed installations, and can be “reproduced” as much as you like. And its developers estimate a cost of about 50 dollars for the elimination of a ton of CO2, which is less than half the cost of current fixed installations.

The idea is original, but it doesn't seem crazy. In Spain we have more than 15,000 km. of roads, in the USA more than 225,000 km, and so we could continue with all countries. There are millions of km of tracks through which thousands of trains circulate every day.
Making a simple calculation, if a wagon that eliminates CO2 is placed in each train, and we estimate that there may be more than 10,000 trains circulating around the world, more than 150,000 tons of CO2 per day could be eliminated. And that's 45,000,000 tons a year, which is not insignificant.
As an idea and project it is quite good. We will have to wait until the corresponding prototypes are made and the results obtained are measured, to see the viability of the project. But as an idea it's a good one.
The problem of Climate Emergency that we have before us is so enormous that all the necessary means need to be applied at the same time to stop producing CO2, and at the same time eliminate the one we have.
We are already very short of time.