The Brave and the Bold, Vol. 1 #121

The Doomsday Express
The Doomsday Express Batman and the Metal Men have all agreed to take part in the train ride to celebrate America's Bicentennial. The train would have themed cars based on America's achievements over the past 200 years, and would also include copies of the Declaration of Independence and the Constitution of the United States of America. Aboard the train with them are Charles Wing, Delores Lake and Ed Fox, curators for the train ride. The Metal Men decide to leave when they get a letter that suggests that their creator Doc Magnus may still be alive, and depart to follow up on it. Batman is left alone on the train with the others, who reveal themselves to be half-Native Americans and they hijack the train in order to pressure the United States government into turning over the land to it's rightful people. When the Metal Men realize they've been duped, they return to the train and try to secure it, and soon word gets to the President that terrorists from another country have planted a bomb aboard the train in the hopes of destroying the Declaration and the Constitution as well. When Batman appeals the Natives about the dangers of terrorism to *all* Americans (be they Native or not) they decide to put aside their differences and look for the bomb. It's Wing's knowledge of American History that helps them find the bomb when he notices that a painting of Custer's Last Stand has one minor inconsistency: Custer's army has the wrong flag design. With the help of the Metal Men, they launch the miniature bomb away from the train where it detonates harmlessly. Afterwards, Wing and his friends realize the errors of their methods and decide that in the future they will use peaceful means of protest.
Release Date: 1975