I just got a like new Williams GP-7-104 diesel loco, Rock Island # 1280.  But it will not move.  The power hums, the lights shine, but the power truck seems to be frozen or jammed,  I can't even get them to wiggle.  On the non powered truck, the wheels did not turn, but I was able to turn them loose.  They look almost dry, but I hesitate to squirt oil into the gears.  I do not have a book.
What do you suggest?  Thanks.  I may be off and on here.

I have a DC Spectrum 2-6-6-2 steam engine.  Bachmann tells me I can convert it to DCC, because it has a board in the tender, which it has.  Before I start, has anyone else done this and hints.  I also want sound.
Thanks