Complex sentence: Some worked out of Johannesburg via Krugersdorp and Zeerust on the Mafeking line as well, where they were allowed to carry an increased coal load of, compared to the which they were allowed on lighter rail elsewhere.
Split into simpler sentences: Some worked out of Johannesburg via Krugersdorp and Zeerust on the Mafeking line as well. Here, they were allowed to carry an increased coal load of, compared to the which they were allowed on lighter rail elsewhere.