A1A-A1A

noun2

1. •
   A wheel arrangement for diesel and electric locomotives with two three-axle bogies / trucks, the two outer axles of each bogie are powered and the centre axle is unpowered.

   • There are five double-bogie A1A-A1A British-built diesel-electric locomotives, which are normally worked back-to-back under the control of a single driver. — 1960
2. •
   A locomotive with this wheel arrangement.