Context: Historical aspects of the Expo line route are noteworthy. It uses the right-of-way for the Santa Monica Air Line that provided electric-powered freight and passenger service between Los Angeles and Santa Monica beginning in the 1920s. Service was discontinued in 1953 but diesel-powered freight deliveries to warehouses along the route continued until March 11, 1988. The abandonment of the line spurred concerns within the community and the entire right-of-way was purchased from Southern Pacific by Los Angeles Metropolitan Transportation Authority. The line was built in 1875 as the steam-powered Los Angeles and Independence Railroad to bring mining ore to ships in Santa Monica harbor and as a passenger excursion train to the beach.

Question: Beginning in what decade did the Santa Monica  Expo Air Line host freight and passenger services?
Answer: 1920s

Question: What year did the Santa Monica freight and passenger service stop running?
Answer: 1953

Question: Diesel powered freight deliveries continued through what date?
Answer: March 11, 1988

Question: What was the result from the discontinuation of using the line for deliveries?
Answer: was purchased

Question: Who bought the Expo line from Southern Pacific?
Answer: Southern Pacific by Los Angeles Metropolitan Transportation Authority

Question: In what year were diesel-powered freight deliveries to warehouses first used on the Expo Line?
Answer: Unanswerable

Question: In what year did the Los Angeles Metropolitan Transportation Authority by the Expo Line from Southern Pacific?
Answer: Unanswerable

Question: In what year were electric-powered freight trains invented?
Answer: Unanswerable

Question: It was decade was the Los Angeles Metropolitan Transportation Authority established?
Answer: Unanswerable

Question: In what year was Santa Monica harbor built?
Answer: Unanswerable