A-A set is powered A unit and non-powered A-unit. Sold only as an A-A roadname set with individual A-units not available. However, a matching powered B-Unit can be ordered seperately. See B-unit listings below for availability and ordering information.*** Compatible with Ready Made Toys® and most LIONEL, K-line, MTH, Atlas, Williams by Bachmann and Weaver electric trains,…this baby-sized F-unit BEEF® Diesel is perfect for use on many O and O-27 3-Rail model train layouts. The BEEF® features... ...scale width/height and is approx. 10 inches long each A or B unit ...A-A is approx. 20 inches long ...B unit is approx. 10 inches long ...A-B-A is approx 30 inches long ...fixed position pilot on A unit ...interior cab detail with opening cab doors ...individual BEEPeople® 'Little Wally' engineer/fireman seated figures ...dual motors ...electronic reverse F-N-R ...directional front headlight on A Unit ...flexible diaphragms ...operating metal knuckle couplers ...cab windows ...metal hand rails ...metal roof lift-rings ...movable roof fan blades ...metal side grilles ...detailed metal chassis ...multi-wheel electrical pickup connector plugs between all A-A + B units. Speed capability has been enhanced to allow higher scale speed operation i.e. faster! *A-A or A-B-A can operate back-to-back in prototypical fashion. A-A units (Dummy A) will include HORN SOUND BEEF® locomotives will operate on 0-27 track, however larger radius track may be required depending upon various track layout designs. BEEF A-A and B unit Diesels BEEF