Hi!  I work in a factory.  What do you do?
Large factories often are located where they have access to multiple modes of transportation. Railways, highways, and water transport are important to the business' success.
I agree.  There are many large roads near this factory.  What do you do for a living?
Factories often use rail transport to transfer goods on wheeled vehicles running on tracks.
I agree.  I've seen that type used.
Rail transport got its roots in the 6th century BC in Ancient Greece.
That's very interesting.  I wouldn't have thought that it was so long ago.
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.
workshops".
Most modern factories have large warehouses or warehouse-like facilities that contain heavy equipment used for assembly line production. Large factories tend to be located with access to multiple modes of transportation, with some having rail, highway and water loading and unloading facilities. 
Factories may either make discrete products or some type of material continuously produced such as chemicals, pulp and paper, or refined oil products. Factories manufacturing chemicals are often called "plants" and may have most of their equipment – tanks, pressure vessels