This list of countries by rail transport network size based on International Union of Railways data ranks countries by length of rail lines worked at end of year updated with other reliable sources. These figures also include urban/suburban mass-transport systems; as well as lines which are not used for passenger services. 1 List.
Review with students what a topic sen-. tence is. (The topic sentence is the sentence. containing the main idea of a paragraph-. often, but not always, the first sentence in. the paragraph.) Put a couple of good models. from the daily newspaper on the overhead-.
1 In order to write a good topic sentence, think about your theme and all the points you want to make. Decide which point drives the rest, and then write it as your topic sentence.  Element #2: Order. Order refers to the way you organize your supporting sentences.