diff --git a/vitamins/rail.scad b/vitamins/rail.scad
index 07c7d6b..2b86aa7 100644
--- a/vitamins/rail.scad
+++ b/vitamins/rail.scad
@@ -40,7 +40,7 @@ function carriage_length(type)       = type[0]; //! Overall length
 function carriage_block_length(type) = type[1]; //! Length of the metal part
 function carriage_width(type)        = type[2]; //! Width of carriage
 function carriage_height(type)       = type[3]; //! Height of carriage
-function carriage_size(type)         = [ type[1], type[2], type[3] ]; //! Size of carriage
+function carriage_size(type)         = [ type[0], type[2], type[3] ]; //! Size of carriage
 function carriage_clearance(type)    = type[4]; //! Gap under the carriage
 function carriage_pitch_x(type)      = type[5]; //! Screw hole x pitch
 function carriage_pitch_y(type)      = type[6]; //! Screw hole y pitch