N scale [1:160]. The Kato catenary masts are a good match for CNSM except they need some cross arms with insulators above the mast on one side. There are 16 of each cross arms with 3, 2 or 1 insulators on the sprue.
Important - please look at "whats in the box" to be sure of what you are purchasing, pictures may include items that are not included for sale. If you are in any way unsure please ask before buying.