Wow Tokyo

I understand that:

100mm is for front hubs.
120mm is for rear new track hubs.
130mm is for rear road hubs.
135mm is for rear MTB hubs.

Is 110mm what NJS frame spacing is or just what old track spacing is?

Yep you got it, both. Like what he said^
Also:
rear

120mm old old road
125mm old road
126mm old road

98mm? front old (smaller axles too)

there's loads of spacings out there baby.