Originally, station agents were on duty 24 hours a day; conductors were used on the Logan Square, Humboldt Park, and Northwest branches to instead collect fares on trains during night and off-peak hours from 1931 through 1937, except for the Northwest branch in 1935. They returned to the Milwaukee branch in 1950, and continued in use until 1995.
Initially, station agents worked 24 hours a day; conductors were employed on the Logan Square, Humboldt Park, and Northwest branches to collect fares during nighttime and off-peak hours from 1931 through 1937, except for the Northwest branch in 1935. They returned to the Milwaukee branch in 1950, and continued until 1995.