Citi initiates coverage on tank barge operator Kirby with 'neutral'

** Citi initiates coverage on tank barge operator Kirby KEX with "neutral" rating; PT at $91

** New PT represents upside of 8.3% on stock's last close

** Citi says current supply-side discipline driving low barge building evidenced by rising industrial fleet age

** Median PT of four brokerages is $124 - data compiled by LSEG

** Kirby's shares rise 0.3% to $84.3 in premarket trading

** As of last close, shares down nearly 21% YTD