I fuse both track power and accessory power. Note the fuse blocks installed. Fuses are as small as practical. Track power usually 7.5 amps and accessory 3 amps. You may want to consider even smaller amperage fuses.
Track fuses (8) are upper left, Accessory fuse power is to the right.
Grainger fuse block that accepts a standard automotive type fuse. AGC, glass cartridge type, available at any autoparts store. Click on the underline phrase to link.
![](http://i175.photobucket.com/albums/w141/mikedian/Mike%20and%20Dianne%20Model%20Train%20Layout/Power%20system%20and%20wiring/IMG_3272.jpg)
Track fused power.
![](http://i175.photobucket.com/albums/w141/mikedian/Mike%20and%20Dianne%20Model%20Train%20Layout/Power%20system%20and%20wiring/IMG_3275.jpg)
Accessory fused power
![](http://i175.photobucket.com/albums/w141/mikedian/Mike%20and%20Dianne%20Model%20Train%20Layout/Power%20system%20and%20wiring/IMG_3274.jpg)
There are two different accessory voltages used on my layout Track voltage (18 volts, used mostly for Atlas switch motors) and a lower 12 volt accessory power (everything else). I used 14ga solid wire to link the fuse blocks together on the right side, you can note a break in the looping bare 14ga which indicates the two different voltage blocks.
Grainger product without the fuse
![](http://imageserver.grainger.com/is/image/Grainger/1CZ43_AS01?$productdetail$)