Questions flew at the city engineer as he explained what the “heaviest construction year” on the Omaha streetcar project would mean for downtown’s Capitol District. About 20 neighborhood business owners and residents attended the January info session put on by the city. “Why do they have to close that down?” probed an exasperated landlord. “Will there be any way to cross that for pedestrians at all?” asked a troubled sports bar owner. When the presentation ended, a nearby apartment dweller