Final answer:
The Airflow Imperial Coupe and the Union Pacific Locomotive both illustrate the early adoption of streamlining in the transportation industry, enhancing efficiency and design aesthetics.
Step-by-step explanation:
Both the Airflow Imperial Coupe and the Union Pacific Locomotive demonstrate the early use of streamlining in the transportation industry. This design approach was integral to improving the efficiency of vehicles by reducing air resistance, which is critical for faster and more fuel-efficient transportation. The concept of streamlining was a significant advancement in the transportation revolution, revolutionizing not just technology but also the aesthetic appeal of transportation vehicles during the early 20th century.