DCC Bus & Dropper Wire

[DART8118]

Went to add some droppers and discovered I might not have enough wire.  Cocooned.  I know very, little about electrics, so, a question for electrical gurus.  Why is DCC dropper wire lighter than bus wire?  Is there an electrical requirement or is it just a matter of costing less?

8118

 

[NIR]

Bus wire is thicker because electricity flows through it to/from lots of droppers. So dropper wire can be thinner and cheaper than bus wire but it doesn't have to be.

Edited March 28, 2020 by NIR

[DART8118]

Thanks NIR