Contents: 2 x 14903 straight track 17.5 mm / 43/64".10 x 14904 straight track 104.2 mm / 4-7/64". 1 x 14905 straight track 76.3 mm / 3". 6 x 14906 straight track 54.2 mm / 2-9/64". 1 x 14909 straight track 33.6 mm / 1-5/16". 1 x 14927 curved track R 4 - 15°. 1 x 14977 manual uncoupler track (not available separately). 1 x 14938 left turnout R 4 - 15° with a polarized frog. 1 x 14991 track bumper 50.0 mm / 1-31/32".Example for expansion: 11150 with 14311.