I have a Penn Flyer Freight set that works fine (0 gauge - 6-30089).  I just purchased some new Fastrack pieces to expand my set (6-12033 & 6-12032).  My locomotive stops running when it gets to a piece of the new Fastrack. 

Why is this happening? 

The connections between the tracks appear to be good.  The overall size of the track is not very large (6' x 3').  The track has power.  The locomotive will start to run from the main power rail (in either direction), but it simply loses power when it hits a section of the new Fastrack.

Any help would be greatly appreciated.

Hello, and welcome to the forum!
For all intents and purposes, track is track no matter what its' design. There should be electrical continuity from 1 end of each rail to the other, continuing into the next piece of track.

If your train stops on the same piece of track all the time, that piece of track is somehow defective. Take that track out, and compare it with another known good track. Check the connections to each rail on each end, then turn the tracks upside down and check the underside of the tracks also. Something will be amiss somewhere.

Important note: Do NOT check continuity of your track with the transformer plugged in and especially not turned on. This will either blow a fuse in your meter at the least, or burn it out at the most.

You can set your meter to read AC volts, power up the track, and check for loss of voltage on the bad track section. You will still need to physically remove the track to inspect it to identify the problem.

In the end, if the track section is bad, and is brand new, just return it to your dealer for an exchange.

Larry