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192 - Twin City Model Railroad Museum - A Big Steam Locomotive – Is it a Mallet or Not?

This video is a continuation of a Zoom Discussion about Steam Locomotives by a group of Model Railroaders / Rail Enthusiasts. One of the members of the group, had commented that many people call any articulated steam locomotive 'a Mallet'. He asked that there would be a discussion about the Mallet - what it is and what it is not. The details: Anatole Mallet's invention was an articulated locomotive that used "compound expansion", the process of using the same steam twice by rerouting exhaust steam from the small diameter "high pressure" rear cylinders into larger diameter "low pressure" front cylinders. Early 4-cylinder articulated locomotives hence earned the nickname "Mallet". Most of those were compound locos until later when 4-cylinder "Single Expansion" variants seemed to show advantages over compounds. By that time, the industry had made other improvements, including: more efficient fire boxes, boilers, superheating and feedwater heaters. These improvements made compounding less advantageous and not worth the additional maintenance and wear on the track. --------------------------------------------------------------------------------------------- If you and your family would like to see models of steam locomotives and other trains operate - Please Visit the Twin City Model Railroad Museum Open every Friday Saturday Sunday and Monday The Regular Museum hours are Friday 10 AM - 3 PM Saturday 10AM – 5 PM Sunday 12 PM – 5 PM Monday 10 AM – 3 PM Spooky Trains runs during October until Halloween. NIGHT TRAINS Night Trains will run on special days in 2024 - please check the website ---------------------------------------------------------------------------------------------------- Other Special Events - Circus Trains, Military Trains (Memorial Day), Spooky Trains (Halloween) and Holiday Trains are run at different times during the year. Please check the website for details https://www.tcmrm.org/ ------------------------------------------- The Museum is located on Transfer Road (Cleveland Ave) near University Avenue next to the old Amtrak Station. The address is 668 Transfer Road - Suite 8 St. Paul Minnesota 55114 -------------------------------------------------------------------- The Twin City Model Railroad Museum has many of different types of trains, buildings and other models – of all sizes - including: O Scale - the internationally renowned O Scale layout - 1/48th G - Garden – about 1/24th Standard Gauge -1/32nd O Scale – 1/48th - Lionel Trains LEGO Gauge - approx. 1/50th S Scale – 1/64th – American Flyer Trains OO Scale 1/72nd HO Scale – 1/87th OOO Scale - 1/152nd N Scale 1/ 160th Z scale – 1/220th. Toy trains are also represented from different manufacturers including: Lionel, American Flyer, Märklin Marx Hornby and others There are also exhibits that show the various scales side by side - for comparision - inlcuding the International Train Display at the rear of the Museum. The Children's Area has many different layouts for the girls and boys to operate as well as work tables where they can create and build models and run wooden trains. There is a LEGO Work Area and Thomas the Tank Trains to run as well. --------------------------------------------------------------------------------