B-B-B-B
"B-B-B-B" means there are four trucks. Each truck has two powered axles. The locomotive frame must allow for significant side play to be provided to the center trucks.
Read more about this topic: AAR Wheel Arrangement
B-B-B-B
"B-B-B-B" means there are four trucks. Each truck has two powered axles. The locomotive frame must allow for significant side play to be provided to the center trucks.
Read more about this topic: AAR Wheel Arrangement