GAP
G Scale Model Trains, 1:1 Sugar Cane Trains
This leads to another question, how small is "small enough" for electronics work? Do you actually want the finest pointed bit you can get, or is a slightly bigger one better as you can transfer the necessary heat faster?
For example, given a choice between a 0.5mm point and a 1.2mm one, which would you use for, say, wiring to decoder solder pads?
Jon.
The size of the tip selected would depend on the size of the pad to be soldered.
This may give some guidance.
http://www.instructables.com/id/Tips-for-choosing-the-correct-soldering-iron-tip/