Opinion

in my opinion, by having trains in the world causes a great deal of pollution to our planet. however, we can change this situation by inventing an underwater railway line. This would be located at the bottom of the waterbed. although it would be a lot of money used to build this train line but, the price to go on the train would be a little bit higher than normal but it would be well worth it because they would be able to see all the fish and plants underwater.