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.
Blue Line (San Diego Trolley)
The Blue Line (officially the UC San Diego Blue Line for sponsorship purposes) is a light rail line in the San Diego Trolley system, operated by San Diego Trolley, Inc., an operating division of the San Diego Metropolitan Transit System (MTS). It currently operates between Downtown San Diego and San Ysidro, at the border with Mexico. The Blue Line has the highest ridership of the San Diego Trolley's three regular lines, transporting 15,094,878 riders during FY 2014 and 16,532,209 riders
Rail transport
Rail transport is a means of transferring passengers and goods on wheeled vehicles running on rails, which is also known as tracks. It is also commonly referred to as train transport. In contrast to road transport, where vehicles run on a prepared flat surface, rail vehicles (rolling stock) are directionally guided by the tracks on which they run. Tracks usually consist of steel rails, installed on ties (sleepers) set in ballast, on which the rolling stock, usually fitted with metal wheels, moves.