Robbie Farah celebrated his 250th Wests Tigers appearance with a stunning 22-6 win over South Sydney Rabbitohs as they were knocked off top spot, although his day was marred as he suffered a concussion.

Farah left Souths to return to Tigers last month and was able to celebrate a victory few would have anticipated, the Rabbitohs' nine-game winning streak brought to an end thanks largely to a steely Wests defence.

The leading point-scorers going into the contest, Souths saw their forays towards the Tigers line consistently fall to nothing, the hosts the more clinical of the two sides and effectively putting the game beyond doubt when Corey Thompson intercepted a pass and raced away to give them a 22-0 lead.

Souths, for whom John Sutton was playing in his 300th game, were able to cross for a late consolation through Cody Walker, minutes after Farah had been taken off a stretcher following an ugly clash of heads with George Burgess.

Farah was able to talk to the media afterwards, but could not recall much of his landmark appearance, which saw Wests move within four points of the NRL play-offs as they backed up last week's win over the similarly high-flying St George-Illawarra Dragons.

"I remember bits of it early on in the first half, but I'll probably have to watch the game back," Farah said. "It's a milestone I never thought I'd achieve at this club. I'm grateful the boys made it a night to remember, kind of.''

The Dragons leapfrogged the Rabbitohs at the top, bouncing back after successive losses to beat struggling North Queensland Cowboys 24-10, marking their first win in Townsville since 2005.

Newcastle Knights' slim hopes of a Finals berth were boosted as they scored 20 unanswered points to come from 24-10 down to defeat to Gold Coast Titans 30-24.

Lachlan Fitzgibbon and Mitchell Barnett crossed before Ken Sio's penalty levelled matters and Connor Watson fed Shaun Kenny-Dowall for the decisive try.