Pennsylvania Railroad Mallet (2-8-8-2) Steam Locomotive

The Mallet is a type of articulated locomotive invented by Anatole Mallet, a Swiss engineer. In the Mallet design, there are two powered driver trucks. The rear drivers are rigidly attached to the main body and boiler of the locomotive, while the front driver set is attached to the rear by a hinge, so that it may swing from side to side. The front end of the boiler rests upon a sliding bearing on the swinging front truck.

Mallets with a 2-8-8-2 wheel arrangement were a familiar sight on the Norfolk & Western Railroad. The Y3 models were built in 1919 by ALCO and Baldwin and were used to haul long coal trains over mountainous terrain.

Faced with motive power shortages during World War II, the Pennsylvania Railroad purchased six Alco-built Y3s from N&W in 1943. The Pennsy gave them the designation HH1 and used them in freight service until the late 1940s.

The O-gauge Mallet on my layout was made by MTH Electric Trains; I purchased it new in early 2002. The engine and tender are almost 26 inches long. It runs very smoothly (no jerky starts), makes a very powerful chugging sound and it's neat to watch those drivers and rods going back and forth. The MTH model is Protosound-equipped, producing realistic whistle and steam sounds.

More photos of the big O-gauge Mallet can be found here. I have also produced a video short (running time - 1:41 min.) of my PRR Mallet in action:


More Train Info & Photos

Main Page - Introduction
Overview - General description
Aerial photo - Large overview of layout
Photorama - Several pages of photos
Construction - Progress photos and descriptions
Layout storage - How we move and store this train layout
Inventory list - It continues to grow
Frequently asked questions - And answers to them
Tips for a better layout - Ten helpful suggestions
My grandson's layout - A simple model railroad for kids
GM Aerotrain - 1950s Train of the Future
Hiawatha - The first streamlined steam loco
PRR Consolidation - Pennsy's steam freight workhorse
PRR GG1 - The most famous electric locomotive on earth
PRR MP54 - Serving commuters for over 50 years
PRR T1 - Sleek and massive Pennsy steam power

copyright Joseph M. Sherlock - 2000-11
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