KIT DOUBLE TRACK - CODE 83 The through plate girder bridge is based on the prototype that sported construction of a bridge deck supported between two plate girders. This type of construction gives it the easily identifiable 'U'-shape. The construction depth on this type of bridge was much less than on other bridges, providing a minimal change of height while clearing terrain. It was a common sight on railroads. Features: Girder measures 8"L Track piece measures 9"L Highly detailed Prototypical bridge track Easy assembly WARNING: CHOKING HAZARD - SMALL PARTS! NOT INTENDED FOR CHILDREN UNDER 3.