This is like watching a car crash over and over again in very very slow motion.
The good news is that you have now realised why your fuses kept blowing and have removed the electrical connections to the track pickups.
The bad news is that you haven't worked out that the reason you keep getting derailments is because your track isn't properly laid on firm foundations.
There was a chap on the forum who used to lay his own homemade track directly on the dirt, but he spent a lot of time building a very firm well packed perfectly level trackbed with embankments and cuttings before putting down the track. A day's hard work with a spade will save you weeks of frustration in the future.
Rik