Not enough power? ...maybe?

Is it possible you crossed the hot and the common when you added additional feeders?

No, this does not sound accurate. As Marty stated above, check your wiring. Also how large is your layout and what type of engines are you running.

@MartyE posted:

Is it possible you crossed the hot and the common when you added additional feeders?

I agree with Marty.

Run one color wire to all of the center rail connections and another to the outer rail connections. This will avoid you're accidently crossing them.

Another thought, make sure none of your cars are derailed causing a short.

Have a code code for all your wiring and stick to it, it will save you a lot of headaches down the road. Sounds like you got a hot center rail and outside common rail track connectors crossed or something is laying across your track rails causing a short. First try removing all train cars and locomotives from the tracks, if that doesn't help, vacuum all the track, you could have 1 strand of wire, a nail, brad, or screw shorting your rails together, and next, lift up the Track to make sure nothing is stuck across the track connectors and check all your wiring for crossed connections. For a sample color code for track wiring, this is what I use: (Note: I don't use Track Power for Track Accessories, I use Accessory Power for them like (18VAC) Switches and (14 VAC) Uncoupling Track so that's why color codes for them is listed). Hope this helps you out. Transformers are in phase and Common Wires connections are separate for ease of doing any troubleshooting until they all get back to barrier strip then all connected together there and both transformers. I run Conventional with 2 MTH Z-1000 Transformers for the 2 separate tracks and 14 Volt Accessory power, and 2 Lionel CW-80 for 18 Volt Accessory Power and DC Voltages for Accessories after going through AC-DC Adjustable Buck Converters set for whatever voltage needed for lighting/accessories

Red for Hot Center Rail Track 1

White for Common Rail Track 1

Blue for Insulated Rail Track 1

Yellow for 18 VAC Hot Accessory Track 1

Aqua for 14 VAC Hot Accessory Track 1

Black for Common Accessory Track 1

Orange for Hot Center Rail Track 2

Grey for Common Rail Track 2

Purple for Insulated Rail Track 2

Pink for 18 VAC Hot Accessory Track 2

Brown for 14 VAC Hot Accessory Track 2

Tan for Common Accessory Track 2

Thanks everyone. You guys are awesome! Yes, turned out the new wiring I just put in was on the wrong rails, so now it is all a continuous circuit. Still can't get a complete run of the track, but its more so uneven tracks and grades: frustrating but hopefully fixable.

Answering some comments: its a 2-8-4 Berkshire (seen better days cause keeps falling off the track). Track set up is based on a posting from years ago for the spiral mountain PE layout (Moonman) but I lengthened the straight sections to take up a whole spare bedroom.