First thing to do is make sure all the pins on every track are tight and making good contact. Loose pins will cause a drop in power, especially at the point farthest from the transformer.
See here for a video on tightening the pins.


For better power distribution, an additional terminal track (or tracks) is advisable.

You can get a larger transformer for your layout, especially if you plan on expanding it. A Lionel CW-80 transformer would be a good unit to upgrade to. The Lionel CW-180 is a hefty transformer that will power a large layout and accessories.

Larry