As we strive to create realistic scenes on our layouts, our attention often turns to model vehicles and the need for research material. I believe this site has been mentioned on the forum previously but for the benefit of those who may not be aware of it, I thought I'd call attention to Hank's Truck Pictures, a site which contains a vast array of photos of transportation equipment including trucks, buses, trolleys and trains. Many different types of vehicles from all eras are included, most of which wear the liveries of long vanished companies. As a transportation professional of almost forty years, I certainly found it interesting to browse and it should provide many more hours of viewing enjoyment. I've included a few sample pictures below the link.
http://www.hankstruckpictures.com/
Enjoy,
Bob