The Washington Baltimore and Annapolis Electric Railway used inter-urban cars as the power for freight trains. The railway also served a gravel pit. This is all documented in the book; Every Hour on The Hour by John Merriken. This book contains many photos of freight cars ( even flat cars ) being pulled by Inter-urban cars. ( not steeple cab motors ). There is at least one photo in this book showing a baggage type inter-urban pulling a string of flat cars from the gravel pit. There are other photos showing strings of boxcars being pulled by inter-urban. This railroad was the only railroad to serve the city of Annapolis, Md. and therefore provided vital freight service to the state capital of Maryland, which included coal for the US Naval Academy. The WB&A interchanged with the B&O in Baltimore and Annapolis Junction, Md. and the Pennsy in Odenton, Md. and perhaps Washington DC. This railroad connected the downtowns of Washington DC, Baltimore, and Annapolis. It hauled passengers as well as freight.