Trinity manager Brian Little admitted his plan to play an ‘open game’ backfired as Gainsborough conceded four on Saturday.
Leon Mettam scored twice for the Blues, but goals from Dave Hewson, Kyle May, Phil McLuckie and Billy Greulich saw the home side claim the win.
“We tried to make a game of it and have a go,” said Little afterwards.
“We worked our socks off, but defensively our set-up was a little light and we had too many attacking players in the side which didn’t work for us.”
Trinity, who released defensive duo Darren Williams and Mark Robinson prior to the game, fell behind after 12 minutes when Hewson slid the ball past Gavin Ward.
The Blues though hit back instantaneously through Mettam’s diving header from an Andrew Boyce cross a minute later.
Both Mettam and Luke Waterfall had goals disallowed before May headed in from a Shaun Vipond corner in the 40th-minute.
Vipond was again the provider for the Reds’ third after the restart when he set up McLuckie to slide the ball in just before the hour mark.
Workington grabbed a fourth through substitute Greulich on 75 minutes before Mettam headed a consolation for the Blues in injury-time.
Workington: Taylor, Smyth, Langford, May, Andrews, Vipond (Main 81), McLuckie, Hewson, Arnison, Rogan (Greulich 71), Wright (Blake 81). Not used: Murray-Jones, Tinnion.
Gainsborough Trinity: Ward, Boyce, Peat, Cowan, Waterfall, Hibbert (Greaves 45), R Williams, Mettam, Kendall, McMahon, Aiston (Beckett 70). Not used: Davies, Spafford, Mayo.
Referee: Glen Hart.
Yellows: Andrews 37mins, Arnison 90mins; Aiston 38mins, Peat 87mins .
Scorers: Hewson 12mins, May 40mins, McLuckie 58mins, Greulich 75mins; Mettam 13mins & 90mins.
MOTM: Shaun Vipond.