The Tigers spoilt the Reds' party back in September when they opened their new Salford City Stadium with a 24-10 victory and, thanks in large to Danny Orr's hat-trick, they claimed their eighth straight win over their opponents in a topsy-turvy game.
The lead changed hands several times but three unanswered tries from the visitors in the second half looked to have extended Salford's unbeaten run to four games. But Orr, who was a surprising omission from Ian Millward's starting line-up to begin with, grabbed his third try of the afternoon before Craig Huby touched down to win it for Cas.
Hull FC surrendered a winning position for the third successive week as Wakefield Trinity Wildcats overturned a 20-point deficit to claim a memorable 32-30 Stobart Super League victory.
Three tries in 10 second half minutes turned the tide in the Wildcats' favour at the Rapid Solicitors Stadium to set up a grandstand finish, with Ali Lauitiiti then barging over for the match-winning score to end Hull's hopes of going third in the table.
The victory was sweet revenge for Wakefield coach Richard Agar, sacked by Hull at the end of last season after four seasons in charge of the Airlie Birds.