N Concrete culvert 1928

Model of a double box culvert with headwall in N Scale. Each of the two tubes is 6.75mm wide and 9mm high (in real life 1.08m or 3.5' wide and  1.44m or 4-3/4' high). The total length of the tube including the front walls is 18.8mm. The headwall has the build year 1928 inscribed.