Slowdown spots on my track

Clean the track and the wheels and roller pickups of your trains with Naphtha.

Make sure the connections between tracks are clean and tight.

Next, depending on the size of your layout, install and wire up 2 or 3 more Lockons at the farthest point from your transformer.

What transformer are you using?

Larry

I have found that my tighter radius areas slow things down. You can try adding an additional power feed to that area also check if the track pins are clean and tight.

John

Checking no-load voltage will help find a completely dead spot but won't tell you anything about slow-down spots. High resistance track joints will usually allow the tiny current a voltmeter draws without much voltage drop. Crimping tubular/Gargraves/Fastrack at the joints can certainly help. Running buss wires and power drops every few track joints can help  as well.

Also too, sharp radius curves cause slow-downs and you can't do anything about that (except run locomotives that have speed control).

I would  use a level and see if it is level.. Also cruise control engines would do the trick if all else fails..

Much thanks for the help guys. I am using a couple Lionel ZW Transformers and they seem to be working well. Seems like it has gotten better since I really clean the tracks. 

Much thanks again, Jerry