Laying Curved Track: How to form a circular model train layout  

Each type of track requires a different number of pieces to form a full circle. Many different model train brands make their own track systems, including Atlas, Bachmann, Kato, Lionel, LGB, MTH, Peco, Piko, and many more.

O Scale

Atlas O Track 

O-27 Curve Track : 8 Pieces

O-36 Curve Track : 12 Pieces

O-45 Curve Track : 12 Pieces

O-54 Curve Track : 16 Pieces

O-63 Curve Track : 16 Pieces

O-72 Curve Track : 16 Pieces

O-81 Curve Track : 16 Pieces

O-90 Curve Track : 16 Pieces

O-99 Curve Track : 16 Pieces

Lionel FasTrack

O-36 Curve Track : 8 Pieces

O-48 Curve Track : 12 Pieces

O-60 Curve Track : 16 Pieces

O-72 Curve Track : 16 Pieces

O-84 Curve Track : 32 Pieces

O-96 Curve Track : 32 Pieces

Lionel O Tubular Track

O-31 Curve Track : 8 Pieces

O-42 Curve Track : 12 Pieces

O-54 Curve Track : 16 Pieces

O-72 Curve Track : 16 Pieces

Lionel O-27 Tubular Track

O-27 Curve Track : 8 Pieces

O-42 Curve Track : 12 Pieces

O-54 Curve Track : 16 Pieces

MTH RealTrax & ScaleTrax

O-31 Curve Track : 8 Pieces

O-42 Curve Track : 12 Pieces

O-54 Curve Track : 12 Pieces

O-72 Curve Track : 16 Pieces

O-82 Curve Track : 16 Pieces

HO Scale

Atlas HO Code 83 & Code 100

15" Radius Curve Track : 12 Pieces

18" Radius Curve Track : 12 Pieces

22" Radius Curve Track : 16 Pieces

24" Radius Curve Track : 16 Pieces

Kato HO UNITRACK

370mm (14 9/16") Radius Curve Track : 16 Pieces

430mm (16 7/8") Radius Curve Track : 16 Pieces

490mm (19 1/4") Radius Curve Track : 16 Pieces

550mm (21 5/8") Radius Curve Track : 16 Pieces

610mm (24") Radius Curve Track : 16 Pieces

670mm (26 3/8") Radius Curve Track : 16 Pieces

730mm (28 3/4") Radius Curve Track : 16 Pieces

790mm (31 1/8") Radius Curve Track : 16 Pieces

867mm (34 1/8") Radius Curve Track : 16 Pieces

Bachmann E-Z Track

15" Radius Curve Track : 12 Pieces

18" Radius Curve Track : 16 Pieces

22" Radius Curve Track : 16 Pieces

26" Radius Curve Track : 20 Pieces

28" Radius Curve Track : 20 Pieces

G Scale

LGB

R1 645mm (25.4") Radius Curve Track : 12 Pieces

R2 823mm (32.4") Radius Curve Track : 12 Pieces

R3 1243mm (49") Radius Curve Track : 16 Pieces

R5 2363mm (93.25") Radius Curve Track : 24 Pieces

PIKO

R1 600mm (23.6") Radius Curve Track : 12 Pieces

R3: 920mm (36.2") Radius Curve Track : 12 Pieces

R5 1240mm (48.8") Radius Curve Track : 24 Pieces

R7 1560mm (61.4") Radius Curve Track : 24 Pieces

N Scale

Atlas N Code 55 Snap Track

10" Radius Curve Track : 16 Pieces

11.25" Radius Curve Track : 16 Pieces

12.5" Radius Curve Track : 16 Pieces

13.75" Radius Curve Track : 16 Pieces

15" Radius Curve Track : 16 Pieces

16.25" Radius Curve Track : 16 Pieces

17.5" Radius Curve Track : 16 Pieces

18.75" Radius Curve Track : 16 Pieces

20" Radius Curve Track : 16 Pieces

21.25" Radius Curve Track : 16 Pieces

30.609" Radius Curve Track : 32 Pieces

71" Radius Curve : 44 Pieces + 1 Piece 4.25" Straight Track

Atlas N Code 80 Snap Track

9.75" Radius Curve Track : 12 Pieces

11" Radius Curve Track : 12 Pieces

19" Radius Curve Track : 24 Pieces

Kato N UNITRACK

216mm (8 9/16") Radius Curve Track : 8 Pieces

249mm (9 3/4") Radius Curve Track : 8 Pieces

282mm (11") Radius Curve Track : 8 Pieces

315mm (12 3/8") Radius Curve Track : 8 Pieces

348mm (13 3/4") Radius Curve Track : 8 Pieces

381mm (15"") Radius Curve Track : 12 Pieces

481mm (19") Radius Curve Track : 24 Pieces

718mm (28 1/4") Radius Curve Track : 24 Pieces