1 Nirjharâs interest is to know different technology and process engineering. 2  Raw iron is found in earthâs crust, as an ore. 3  Iron ore mostly found as Fe 2 O 3 (the form of iron oxide found as the mineral hematite). 4  At present, blast furnace is most commonly used furnace to produce iron.
The weight of a railroad tie depends on their size and specifications. They can range anywhere from 100 to 300 pounds.
Approximately 3,520 wooden crossties are used per mile of mainline railroad track in the US (distance between ties is nominally 18 including one tie and the crib), 2,640 per mile (30 per 60 ft rail) on main lines in the UK.