It might be a pilot model from SMR trains, they announced one but it never went into production and SMR is no longer in the locomotive business.
From the SMR website:
In the struggle to survive, SMR tried a low-cost, self-financed project, the B&O Grasshopper. Believing the hype surrounding 3D printing, I thought it could be produced in the US. But it was a delusion. I was Don Quixote tilting at a windmill. It is simply not possible to produce brass model trains of SMR's required quality, in limited quantities and at a reasonable cost in the United States. The needed expertise doesn't exist and government regulations prevent traditional brass train manufacturing methods. During this hopeless battle, which lasted until 2016, I spent the last of my personal resources in a lost cause.
Rusty