Using track power, I use either Hillman clamps or the standard LGB sliding connectors, but after several years of use, and many experiments with different layouts, I had big problems with electrical continuity through the LGB connectors.

I solved this problem with the use of 2 stainless steel self tapping screws - 2.2x10 - and drilling either side of joint using 2mm drill bits. Drill through the connector and brass rail section at about 45 degrees, and drill from outside of track to avoid any interference with rolling stock wheel flanges. 

TIP - invest in quality drill bits, as the cheapies don't last long.

It looks more realistic than the clamps, and can be spot touched with dark brown paint for effect, if necessary.

No more continuity problems ever again, in any weather conditions.