Atlas switcher , burnt smell

[teejay]

I've had my locos stored in their boxes , and in a sealed plastic tub for a number of years ....they haven't been run in atleast 5 years . I pulled out an Atlas switcher , Digitrax equipped , fired it up ....light came on immediately and I ran the loco back and forth , total about 20 feet . I noticed a burnt odor . Should this be alarming ? I haven't lubricated anything , yet .

Thanks , T