Track gauge is measured inside of rail to inside of rail. Based on your measurements and on the name New Bright, your train is 'G-Scale,' running on 45mm (~1.75") gauge track. Your train should run on any track made for 'g-scale.'
That track is very available, starting with the indoor only track that Bachmann sells, on up through the better quality brass track sold by Aristocraft, U.S.A. Trains, Accucraft, Train-Li and others. Some of those suppliers also provide very high end stainless steel and nickel silver track.
If you just want to expand your current set and to only run it indoors, the Bachmann track will work very well. Check the internet for pricing and availability of track. Prices vary widely.
Happy RRing,
Jerry
That track is very available, starting with the indoor only track that Bachmann sells, on up through the better quality brass track sold by Aristocraft, U.S.A. Trains, Accucraft, Train-Li and others. Some of those suppliers also provide very high end stainless steel and nickel silver track.
If you just want to expand your current set and to only run it indoors, the Bachmann track will work very well. Check the internet for pricing and availability of track. Prices vary widely.
Happy RRing,
Jerry