This can be achieved by internal or external expansion. Because the different firms are involved in the same stage of production, horizontal integration allows them to share resources at that level. Topics
Up until the 1990s, the average freight train in Canada was about 5,000 feet (1.54 kilometres) long and weighed 7,000 tons. But it is now not uncommon to see these trains stretch to 12,000 feet, sometimes as much as 14,000 feet (more than four kilometres), weighing up to 18,000 tons.he CN train involved in the derailment outside Brighton, for example, was built as a conventional train would be, with three locomotives in the front hauling 137 rail cars behind. But it was stretched out 8,850 feet and weighed nearly 12,000 tons.
I'm simplifying and rounding to keep this easy. The loaded coal train is 135 cars, each car weighs 143 tons (roughly 22 tons of car and roughly 121 tons of coal). That's 19305 tons for the cars, and there's 3 engines (GE AC4400CW), that total roughly 630 tons.