The extensive photo collection of Northern Pacific steam locomotives was taken mainly in the late 1930s to 1950s era in numerous locations in Minnesota, Wisconsin, North Dakota, Montana, Idaho, Washington and Oregon.

The locomotive types included are American (3), Atlantic (1), Mogul (6), Prairie (32), Ten-Wheeler (39), Consolidation (48), Mastodon (1), Pacific (81), Mikado (204), Northern (31), Mallet 2-8-8-2 (7), Yellowstone (4), Challenger (17), 0-6-0 Switcher (67), 0-8-0 Switcher (17) and Heisler (1).

Almost all of the 560 photographs are from original black & white medium-format (2x4) negatives and presented in book form on a self-starting CD-ROM with information on the locomotives. Works in PCs and Macs. The photographs can be printed out.

Prairie Works, Photo CD-ROM Book.