Metra Electric Line service will resume between Millennium Station and Kensington/115th Street and along the South Chicago Branch.
The 31-year-old was shot inside his home in the 3400 block of West Franklin Boulevard.
Temperatures did not go above zero between 6 p.m. Tuesday and 10 p.m. Thursday, according to the National Weather Service.
The bus had been without heat for a significant amount of time, police said.
Two children were taken to a hospital for cold-related injuries after they were found walking around outside alone in Arlington Heights.
The 67-year-old was sitting inside a home when he heard shots and felt pain in the back of his head.
Temps will feel like 15 to 30 degrees below zero Tuesday before plunging further overnight to “extremely dangerous” levels of minus 40 to 50 degrees.
The 34-year-old was shot in the left hand.