Tony P says:

Hi Klaus, What scale are you in and what track are you using. Assuming that your track is nickel silver, are all your joints tight, if they are did you solder all your joints, if you did and you still have dead spots you can run live feeds to these dead spots, and maybe you just need to add live feeds because of the distance from the power source making sure polarity is correct, if all of this is good clean your track real good, if you did this check your locos and make sure they are clean and all contact points with the track are clean and in good working order. As Robert said all of these ideas are explained in greater detail in older posts and in Roberts book. To all readers and those who ask questions Robert has addressed this before please be more specific in your questions some recent questions have been too vague to answer, ex: scale and track noted by one who answered a question assuming a scale “HO” for turnout problems and this one what “track” is being used. Tony P