DL&W Pete, the track is MTH flex track on cork roadbed, the rail head is quite thin so from above it looks good, close to scale rail. The small PRR light Mikado was made by Lionel, I believe it was in the 2005 catalog. These were made in a lot of road names, I have six of them. A B&O version is on the track to the left of the roundhouse. Lionel also made a light Pacific that is similarly sized to the Mikado. It is engines like these that drove me to use the .138 rail.
As mentioned in the post just above, be sure to use the NASG website. I do not have a YouTube channel but I have posted many layout pictures here on the OGR site. There is also a video of my layout when it was about 90% complete linked from the NASG website.