Sleepers, Posts and Beams

Douglas-firs are medium-size to extremely large evergreen trees, 20–100 metres (70–330 feet) tall (although only Pseudotsuga menziesii var. menziesii, common name coast Douglas-firs, reach heights near 100 m)[9] and commonly reach 2.4 m (8 ft) in diameter,[10] although trees with diameters of almost 5 metres (16 feet) exist.[11] The largest coast Douglas-firs regularly live over 500 years, with the oldest specimens living for over 1,300 years.[12] Rocky Mountain Douglas-firs, found further to the east,[13] are less long-lived, usually not exceeding 400 years in age.[14] There …

Quercus robur is a large deciduous tree, with circumference of grand oaks from 4 metres (13 feet) to an exceptional 12 m (39 ft). The Majesty Oak with a circumference of 12.2 m (40 ft) is the thickest tree in Great Britain,[5] and the Kaive Oak in Latvia with a circumference of 10.2 m (33 ft) is the thickest tree in Northern Europe.[citation needed] The largest historical oak was known as the Imperial Oak from Bosnia and Herzegovina. This specimen was recorded at 17.5 m in circumference at breast height and …