Pacific, Mountain, Mikado and Santa Fe-type lotives. The light versions were built with axle loads of about 54,000 pounds for service on light rail, and were designated with the suffix "A". The heavy versions used a 60,000 pound axle load, and were designated with the suffix "B". 1856 original lotives of all types ude, but are not limited to: Extra 2200 South Magazine, Diesel Era Magazine, Canadian Trackside Guide, LocoNotes ll, Railfan Magazine, and Trains Magazine.Dec 05, 2019 · The production function can be expressed as follows: q= min (z1/a, Z2/b) Where, q = quantity of output produced. Z1 = utilized quantity of input 1. Z2 = utilized quantity of input 2. a and b = constants. For example, tyres and steering wheels are used for producing cars.Berkshire Steam Lotives (1 of 2) In the 2015__ American Flyer Catalog, Lionel introduced a line of Berkshire Steam Lotives. Production extended into 2021. Because 18 different roadnames and numbers were produced, I have split them up over two web pages: #42539 through #44025 are on this page. #44026 through #47923 are on page 2.