74 



Sekviceabiott of Ties 

 /. Species native to Illinois 



Untreated ties Treated ti^s 



Heavy traffic Light traffic* Heavy traffic Light traffic* 



Species Years Years Years Years 



Ash 3 3 10 16 



Beech 4 4 8 14 



Birches 2 2 8 14 



Cherry 4 6 7 14 



Elm 2 3 6 12 



Gums 2 2 10 14 



Hackberry 2 3 6 12 



Hard maples 4 4 10 14 



Hickory 3 3 10 16 



Honey locust 3 3 10 16 



Red oak 5 5 10 16 



Soft maples 2 2 6 12 



Sycamore 2 2 6 12 



White oak 



Heart 8 10 10 16 



Sap 7 8 10 16 



Walnut, black 



Heart 6 15 8 16 



Sap 5 12 8 16 



Butternut 1 2 1 10 



II. Species not constituting a source of native 

 supplies of cross-tics 



Chestnut • 



Heart 3 14 3 16 



Sap 2 10 3 16 



Cypress 



Heart 4 12 4 14 



Sap 3 5 4 16 



Douglas fir 



Heart 5 8 7 16 



Sap 3 3 7 16 



Hemlock 3 4 7 14 



Larch 3 6 7 14 



Pine 



Heart 6 12 8 Ifi 



Sap 3 3 8 IG 



Southern Illinois is the center of the industry of commercial wood- 

 preservation, containing nine large plants, while three others are located 

 elsewhere in the state. This is due to the strategic location of this region 

 with respect to available supplies of hardwood and pine ties requiring 

 treatment, on the one hand, and to railroad mileage in need of ties on 

 the other. This fact offers a distinct advantage to producers of local tie 

 timbers, which is only partly nullified by the practice of offering uni- 

 form prices for ties delivered on the right-of-way. 



• Llght-trafflc tracks are those carrying not more than ten million tons annually. 



