Steel weighs approx 7t/cum.
Iron ore @60%Fe weighs approx 4t/cum.
37t wagon would hold approx 9cum iron ore.
eg 2m wide x 1m high x 4.5m long wagon.
This is a short wagon!!!
75t wagon would hold approx 18cum iron ore.
eg 2m wide x 1m high x 9m long wagon.
This seems more reasonable.
100t wagon would hold approx 25cum iron ore.
eg 2m wide x 1.5m high x 8m long wagon.
This is better.