In order to strengthen the scientific register of Persian language, word selection for the scientific terms of foreign languages and accurate knowledge of word-formation mechanisms in this register and its capacities are of considerable importance. Few statistical and corpus-based researches have been conducted on the word formation processes of the approved terms of the Academy of Persian Language and Literature. One of the fields not comprehensively addressed so far is the field of transportation within its four main fields. Therefore, the present research, using a descriptive-analytic method, is a comparative study of the word-formation processes of the approved terms of the Academy and their English equivalents in the four fields of transportation (intra-city road, marine, rail and air transport) in the first eight books, including 2929 Persian terms and 2929 English terms (5858 words in total). The results show the dominant word-formation processes in the Academy's words in the field of transportation are respectively compounding (11.77%), compound-derivative (6.69%) and derivation (4.06%). Also, less than one percent of the corpus is formed using other word-formation processes. Moreover, 73.36% of words are the result of syntactic structure and 3.14% are used as simple words. By contrast, the dominant word-formation processes of the English equivalents are respectively compound-derivative (39.56%), compounding (32.57%) and derivation (5.87%); Less than 5% of all English words are made by using the processes of abbreviation, clipping and blending. In addition, in English language, 10.03% of the data are syntactic structures and 2.7% of the words are simple words.