Track Power

Looking for suggestions.I have O gauge Lionel with Legacy. I have a 180 w power brick powering the track. All was running fine then the brick shorted out. Now when I power up all is fine until I power up any loco, then it shorts out again. Removed all rolling stock, same story. Just shorts out when a loco draws power.

Any suggestions on how to proceed to locate problem.

You might want to pose this question to the Toy Trains forum. I think they have more experience with Lionel O gauge.