 In the 1930s the city 's transportation system was marred by violent protests . Transit workers wanted to <unk> , and with the main company 's management against any effort to change Omaha 's reputation as a non @-@ <unk> city . After the introduction of buses in the early 1950s , streetcars were closed down , and in the last years of the decade the city began construction on its components in the Interstate Highway System . 
