Morley Safer - Correspondent:  Not all the trolleys are in museums . A few cities like New Orleans and Philadelphia never gave theirs up . They 're feeling pretty smug about that now . More dramatically , some other cities have bitten the bullet and resumed service ... gone back to the future . Like San Diego , for instance . They 've been running trolleys since _ 1981 _ and adding new routes constantly . It seems to work unbelievably well . Listen to San Diego Mayor Maureen O'Connor .
Maureen O'Connor: Everyone in San Diego loves the trolley . The only problem now here is , we ca n't get them into the neighborhoods fast enough . They 're a clean , efficient system , and they 're very cost - effective .