Hi Everyone -  I am new to model trains and have just bought a power pack to get things "rolling".  The problem I am having is there is no current coming from the dc track connection.  I checked with a multimeter (no amperage) at the source terminals so I bought another power pack (different kind) with the same problem.  The AC terminals are measuring voltage/amps. I just can't get the DC terminal to work  No shorts that I know of because other electrical machines work fine on the outlet. Maybe a circuit breaker trip. I have the atlas universal power pack.  Can anyone think what the problem is?  I am getting frustrated and am trying to get my 1st locomotive to run.  I have no idea what to do.  Please help.  :O)