At a Railway Coffee Stand, a Battle Over Whatâs Fair
Gregory Maher fights Greenwich, Conn, over its decision to transfer his eight-year-old coffee concession at Metro-North station to Adam Fairbanks, who is blind; Greenwich cites federal and state laws giving preference to blind regarding opertion of concessions on government property; Fairbanks participated in state-run training program; Maher concession operates on month-to-month lease; photo (M)