I have to wonder, what is the scale of a train in Sweden? here in the states the vast majority of our locomotives are dedicated solely to freight.

Speaking from experience having worked on locomotive engines in the past, the sheer magnitude of US rail is difficult to comprehend. a fully loaded freight train can weigh north of 20,000 tons (18.14 million kilos). They can often times be nearly 2 (3.2km) miles long. and heres the reason "rail bikes" are illegal in the US:

they can take more than a mile (1.6km) to stop.