The track pattern for the current starter sets can be expanded with the B1 Track Extension Set. This can be done smoothly with the entire Minitrix concrete tie track program. The 14534/14535 electric mechanism can be installed in all the turnouts. Contents: 2 x 14500 straight track 112.6 mm / 4-7/16". 2 x 14503 straight track 17.5 mm / 11/16". 8 x 14504 straight track 104.2 mm / 4-1/8". 4 x 14594 straight track 126.3 mm / 4-15/16". 1 x 14518 curved track R5 - 15°. 1 x manual uncoupler track (not available separately). 2 x 14538 left turnout R4 - 15° with a polarized frog. 1 x 14539 right turnout R4 - 15° with a polarized frog. 1 x 14591 track bumper 50.0 mm / 1-15/16". Sample for expansion: 11161 with 14321 150 x 60 cm / 60" x 24" Suggested board size for expansion with the starter set and the B1 and B2 extension sets.