5.
a) Secondly, trains (also called railroads) can be used to transport large quantities of goods over great distances.
b) For instance, many products such as machinery are very large and heavy, and therefore difficult to transport by air or road.
6.
a) Lastly, I believe there is a human factor involved in a train trip.
b) That is to say, you have the opportunity to meet and talk to some interesting people on a long train trip, and who knows, you might even make some new friends.
7. So, those were some thoughts on the kind of transportation I like best.
