AAR Wheel Arrangement - 2-B

2-B

"2-B" means there are two trucks, or wheel assemblies. The "2" truck is under the front of the unit, and has two idler axles in a row. The "B" truck is under the rear of the unit, and has two powered axles. Examples include the three lightweight power cars built by ALCO/ACF in 1935 and 1937 for use with the Rebel streamliners.