Yes Bill definately Scientific Toys.
We get them here in Oz at Xmas in one of our national brand stores called Big W, costs $89.00 for loco (our dollar is approximately par with yours now), gondola, box car, action flat car with 2 elves pumping as on a section car, caboose, an oval of plastic track with R1 curves, remote control and various rail way related signs.
I picked up two sets the first year that they were offered, several sets were unsold by Xmas and I picked them up at half price.
Be aware that the gears are noisy and delicate. Not sure that your grandson will get much use from one as youngsters lack finesse in handling locos.
If you are serious about getting him running, spend the money to provide something that will run, and run, and run, no matter what he does - guess that might be a second hand LGB setup for battery and RC (use the RC from your scientific toys, I did).
I wish you luck and hope that your grandson joins the fraternity of loco drivers very soon, mine has at 2 years old and the glow in his face is worth more than almost anything.
Tim