Geometry

The buttons at the bottom of this web page refer to the geometric guidelines of my TT scale model railway for the topics shown. I have only just started, and I will update the web pages every time I make further progress with the project.

The table below gives an idea of my TT scale model railway compared to real world measurements and the commonly used model railway scales H0 and N.

	Real world	H0	TT	N
Real world	1	1/87 0,01149	1/120 0.00833	1/160 0.00625
H0	78	1	13/20 0.65	39/80 0.4875
TT	120	40/29 1.37931	1	3/4 0.75
N	160	160/87 1.83908	4/3 1.33333	1

Decimal figures are down to 6 significant digits.

For 2D drawings the commonly used drawings grids are:

Object	Property	Unit	Railways standard	H0	TT	N
Grid		[mm]	-	550	400	330

The scale and grid size used to make the geometric design drawings for my TT railway are:

Object	Property	TT track plans
Drawings	Scale	1:10
Drawings of yards and stations	Scale	1:5
Grid	Size	400 mm

The image below is a scale model of my TT scale the model railway made of cardboard. It was made to see if it was correct geometrically. In the middle you see a copy of the Schwarzach-St.Veit station. You can compare this with the picture above of the real station. There are differences and that's because you have to leave things out due to lack of space. For example, the model of the station has fewer tracks and is a third of the real length.