This is the N Scale Generator Flat Car Load Kit (for 50' Flat Cars) from American Model Builders.
Designed to fit 50' or longer N scale flat cars, our latest load features seven cast resin generators (two different designs included), ready for painting, along with easy to assemble laser-cut wood framing and blocking.
American-Models Product Number: 519
Walthers Product Number: 152-519
1 Kit Assembled load measures 3.25" L x 0.625" W x 0.4375" H