Thanks Hot Water and RickO; I have googled micro fasteners and came up with 2 places: 'MicroFasteners' and 'FastenerExpress', who have screws that are close.
Hot Water - could not find any out of New Jersey. OOPS, RickO's suggestion to give Lionel a shot disappeared.
Have found 2M X .4 X 8mm but no 1.9 mm X .4 X 8mm; does anyone know what 2M means as compared to Lionel's 1.9mm.