The image is a photograph of a sign on the side of a train. The sign is titled "Diesel Power At Last!" and has a blue background with white text. The text is divided into three sections. 

The first section on the left side of the sign has a list of diesel power at last, with the title "Class GM Number 2" at the top. Below the title, there is an image of a diesel locomotive with a red and white stripe running along the side. The locomotive is on a railway track, with a blue sky and clouds in the background.

On the right side, there are two smaller images of the same locomotive, one in red and the other in white. The first image shows the locomotive in motion, while the second image shows it in motion. The third image shows a train on the tracks, with smoke coming out of it. The train appears to be in motion as it moves along the track.