Glued joint uses layers of insulating 'cloth' 'pasted' with epoxy as insulation. The bolts are high tensile steel. The joint is glued together so that it does not act as a fish plated joint. The 4 bolt version is called G3S = suitable for short welded ...

Glued joint uses layers of insulating 'cloth' 'pasted' with epoxy as insulation. The bolts are high tensile steel. The joint is glued together so that it does not act as a fish plated joint. The 4 bolt version is called G3S = suitable for short welded rails only (read: 3 rails welded together, i.e., joints every 39 m) while the 6 bolt version (with 940 mm fish plate) is called G3L = suitable for long welded rails.

In the picture, you can clearly see the layers of the insulating cloth behind the fishplate. The HTS bolt heads are also clearly visible. The joint seems to be made in-situ.

The other type of joint is block joint which has insulating glass nylon filled (GFN) moulded material, seen as a yellowish plastic type strip, between the fish plate and rail and also ferrules in the hole in rail, around the fish bolts. The fish plates are skimmed to accommodate the insulating material. A rail section shaped piece is used between the rails to complete the insulation. The bolts are ordinary fishbolts and a strip of the insulating material is provided on the outside of the fishplates also, between the fishplate and bolt heads and the nuts.