A bit of history:
A 4-4-2 Locomotive refers to the classification of locomotives under the Whyte notation for the classification of steam locomotives by wheel arrangement, where 4-4-2 represents a configuration of four leading wheels on two axles, usually in a leading bogie with a single pivot point, four powered and coupled driving wheels on two axles giving tractive effort, and two trailing wheels on one axle, usually in a trailing truck which supports part of the weight of the boiler and firebox and gives the class its main improvement over the 4-4-0 configuration.
This wheel arrangement is commonly known as the Atlantic type, although it is also sometimes called a Milwaukee or 4-4-2 Milwaukee, after the Milwaukee Road which employed them in high speed passenger railroad uses.
Source: Wikipedia
Specifications of the Atlantic locomotive:
- Drivers: 17 Spoke x 10″ Diameter
- Cylinder Bore: 2.750″ Diameter
- Cylinder Stroke: 3.500″
- Piston Valves: 1.500″ Diameter
- Overall Length of Frame & Pilot Beam: 71″ Approx
- Tender is 5 ft long
- Atlantic locomotives are 10.5 inches shorter
- Castings: Top Quality Castings from Top Quality Commercial Foundries
- Accuracy: Precision CNC Machine Work
- Axles: Hardened and Ground
- Axle Bearings: Needle Roller Bearings
- Crank Pins: Hardened and Ground
- Side Rod Bearings: Needle Roller Bearings
- Main Rod Bearings: Needle Roller Bearings
- Cylinder Block: One Piece Casting, Fully Cored Including All Intake & Exhaust
- Passages, Very Free Breathing
- Baker Valve Gear Frame: Silicon Bronze Casting
- Baker Valve Gear Internals: Stainless Steel Lost Wax Investment Castings