Welcome to the forum. A picture would go a long way towards helping you determine a value. If no picture is possible, try looking for a manufacturer's name on the bottom of the locomotive and the tender (coal car). When you look at it from the side, how many little wheels are on the front, how many bigger wheels are in the middle and then, how many smaller wheels are on the back---not including the coal car. See here>>> http://en.wikipedia.org/wiki/Whyte_notation Hope that helps.