There are three black/yellow units remaining 3001, 3003 and 3006.

See also:

• All Alaska Railroad locomotives use the Nathan 5 chime K3LA horn
• Engineering drawings: 2003-2008, 3001-3015
• Locomotive features (5/22/11)
• You'll find a complete historical roster here and a guide to locomotive paint schemes here.
• GP40 info
• GP38 info
• SD70MAC info
• Modern GP paint scheme
• Anchorage Locomotive Fueling Facility

Additional notes:

• The 40XX series are what the railroad calls "straight macs" or freight units. The 43XX units you will notice have big angular or flaired radiators. These are more a combo loco. They can be used for freight, but are specially built with extra capacity and ability to provide electricity to the passenger cars.