A Glued Joint (specifically an Insulated Glued Joint) is a permanent fixture in the track used to create electrical isolation between two rail sections. This is necessary for the operation of track circuits, which detect the presence of a train for signaling purposes. Unlike a mechanical fish-plated joint, a glued joint is a rigid structure where the fish plates, bolts, and rail ends are bonded together using a high-strength epoxy resin and insulating liners (usually fiberglass). There are two main types: G3(L) for standard use and G3(S) for high-tension areas. Because the joint is “glued,” it does not allow for any movement between the rail ends. This makes it a “solid” part of the rail, which is essential for use in Long Welded Rails (LWR) where longitudinal gaps cannot be permitted. The epoxy provides both the adhesive strength to resist the massive pulling forces of cold weather and the dielectric strength to prevent electricity from jumping the gap. A failure in a glued joint (either mechanical breakage or electrical “bleeding”) can cause a “false red” signal, leading to significant operational delays. Drawing Number:-T-2572,T-671