Measured as good as possible. All dimensions in mm.
Track for Z-scale are available from different vendors, Märklin, Peco and MicroTrains(+ some more).

Here you can find the dimension for the different types:

     
Brand WT WB H C G TH TW TL S
Märklin 0.75 1.2 1.58 62 6.60 1 1.2 11.8 3.74
Micro-Trains 0.50 1.2 1.45 57 6.65 1 1.1 12.4 2.54
Peco 0.80 1.3 1.65 65 6.70 1 1.5 12.4 4.03
     
WT=Width Rail Top  
Schematic track drawing, legend
WB=Width Rail Bottom  
H=Height Rail  
C=Code(Calculated)  
G=Gauge, inside between rails  
TH=Tie Height  
TW=Tie Width  
TL=Tie Length  
S=Tie Spacing  
 

The different tracktypes available:


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