You're correct that "transportation" is a singular noun. However, in the context of your original question about trucking companies that hire drivers with multiple preventable accidents, the focus is on the companies themselves rather than the term "transportation." If you're asking about the word "transportation," it indeed refers to the act or process of moving people or goods from one place to another and is used as a singular noun. For example, "Transportation is a vital part of the economy."
Yes, the word railway is a noun, a singular, common, abstract, compound noun; a word for a commercial organization responsible for operating a system of transportation for trains; a word for a thing.
Bacterium is the singular word.
the singular word it is salmon.
singular
Adenoma is the singular of adenomata.
The word 'Phenomenon' is singular. The plural form is 'Phenomena'.
singular of the word stitches is stitch.
Lance is singular.
The word "hang" is singular.
The word dog is the singular form.
Yes, the word "document" is singular.
The singular form of the word flagella is flagellum.