Have you ever heard of rail transport? It is also known as train transport.
I have! We recently got a new rail service in my town. It's really fascinating. I'll bet there's a lot of history behind rail transport.
That is extremely fascinating. In contrast to road transportation where the car is in control. On the rail the rail is in control.  
Well, that certainly makes sense! Do you think most trains are diesel or are some still coal powered?
I would imagine diesel, In fact, I am pretty sure the LYNX Blue Line is a light rail in Charlotte, NC that is diesel. 
Oh neat! I think the new train in my area is diesel as well. I would imagine using trains is very cost efficient for companies, cheaper than truck or air. Do you agree?
Yes, that would make sense. What about a trolley system? Like the San Diego Trolley.
Yeah, I never thought about it, but that would certainly be a form of a rail transport. I haven't been to San Diego, but Disney World has a trolley that runs on rails. It's fun to ride.
Oh! I have never been to Disney World. Yes, The Blue Line in San Diego goes from downtown to the Mexican border.