Can anyone offer advice on why this locomotive won’t run?

Please go easy on me… as I’ve said in other posts, I’m cleaning up my Dad’s lifetime collection of trains and learning as I go. 🙃

How can I get this guy moving? Any idea what’s wrong?

When I put it on the track, I see little sparks, but it won’t move. I see the light come on for a split second.

I bought a little set up at a train show so I could test each one before I list them.

Out of 150+ locomotives sold so far, only 2 have given me trouble.

It’s been sitting in a box full of other trains in the original boxes in a temp controlled room for several years.

What can I try?