This sign in front of the Main Post Office on Brook Road in North Side salutes the let- ter carriers, clerks and other postal workers who have quietly but steadfastly continued to deliver mail and packages during the pandemic. They are among the ordinary, often overlooked workers who have helped maintain some semblance of normalcy during the COVID-19 shutdown — from restaurant workers to construction crews and road pavers, truck and transit drivers, agricultural workers and a host of others who have soldiered on despite the risks. The sign celebrating postal workers may have heightened significance as the U.S. Postal Service pleads for a bailout from Congress due to a rising tide of red ink. So far, new funding has not been forthcom- ing amid growing concern about the public mail operation’s financial health and ability to sustain its operations given its losses since the coronavirus hit.