Brio uses a numbering system to designate its standard track sizes. Straight tracks come in four basic lengths – mini, short, medium, and long.
The straight tracks are designed to work with the modular nature of the Brio wooden railway system, so each track is an exact fraction of other tracks. Two mini tracks equal the length of one short track. Two short tracks equal the length of one long track. Three medium tracks equal the length of two long tracks.
Standard straight tracks have one male (peg connector) end and one female (hole connector) end. Mini, short, and medium straights are also available as male-male (two pegs) and female-female (two holes) track pieces. These pieces make it easy to connect mismatched ends of tracks when doing complicated layouts.
- A2: Mini Straight
- B2: Mini Straight Male-Male
- C2: Mini Straight Female-Female
- A1: Short Straight
- B1: Short Straight Male-Male
- C1: Short Straight Female-Female
- A: Medium Straight
- B: Medium Straight Male-Male
- C: Medium Straight Female-Female
- D: Long Straight