Having the top of the rails clean is a good start! That provides great electrical contact between the track section and locomotive. However, you are likely experiencing issues with good electrical contact contact between the track sections. With the presumption that you are using the good ol' standard tubular track, you likely have loose connections. You can use needle nose pliers to crimp the flat sides of the female ends together. If that doesn't help, it could be that the inside of the track where the pins make contact is dirty. You can clean that critical 1/2 inch with drill using a 3/32 or 5/64 bit for O27 track or a 7/64 or 3/32 for standard O.
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