This part uses the following Kato Unitrak parts: Yellow line - 2 x 20-120, 1 x 20-091(S29) Red line - 2 x 20-110, 1 x 20-091(S29) Side Dimensions: 13" (331mm) Module ends (connect to adjacent modules) 14.17" (360mm) Front face. 7.24" (184mm) Short Back sides 22.36" (568mm) Back Face Cut outs: Front Face: Digitrax Panel Back Face: Anderson 1470G1-BK PowerPole connector Our Design: Included adjustable legs to correctly set module height (from 2 ¾” to 4”) Each module is precision-engineered for seamless integration Kit boards designed to fit only one way reducing the risk of incorrect assembly Interlocking corners make stronger joints and keeps corners square ¼” birch plywood adds to the strength yet light-weight for easy transport An included skyboard slots into the module providing a removable backdrop that disassembles for easy transport Instructive track markings and access holes for easy wiring and assembly Included in the kit: 5 side panels 3 top panels that secure together to create the sub-roadbed 2 cross braces for a strong module 5 adjustable height screw legs Assembly manual complete with images of each step Not included: Wood glue Track References: [1] https://nationalt-traklayout.com/t-trak-standards [2] https://www.nrail.org/T-TRAK-History