little engines

ALCO Hudson

The ALCO Hudson (4-6-4) was developed from the Northern.

The Little Engines ALCO Northern and Hudson (4-8-4 & 4-6-4) are two of the largest 1-1/2" scale steam locomotives commercially available with some finished engines weighing as much as 2500 lbs. These engines are beautifully detailed and we recommend these for the person who wants something large, different, and challenging to build. Design changes to the engines have eased the build making it more accessible and buildable by those who are not professional machinists. We suggest that anyone considering either one of these beauties try and visit one at a local track or at a club around the country to get a sense of the sheer size of the locomotives.

The original Northern as designed between 1947 and 1951 was primarily patterned after the Union Pacific 800 class ALCO built Northerns, but our parts can be used as the basis for any of the larger Northerns and Hudsons used by many of the railroads around the country. Available castings for these engines, a water-jet cut frame, 80" box-poc or spoke drivers, newly designed individual journal boxes, a newly designed swing-link lead truck-courtesy of Chuck Hackett, designed by Dennis Riches, some laser cut and CNC machined ready to install parts-and much, much more.

The ALCO Northern and Hudson are truly unique steam locomotives and almost all of the parts have been retooled and re-patterned. The castings available today are of superior quality. Original drawings and blueprints have been scanned and are currently being digitally re-mastered.

While the castings available to build these engines are plentiful, many of the original parts were built up from bar stock. As time permits many of these parts will become available as castings to aid the builder. We welcome a question/answer session to assist in the decision to build one of these two engines.

Check out the ALCO Hudson gallery here

Check out the ALCO Northern gallery here

Specifications

Engine Length 96 inches (Northern), 84 inches (Hudson)
Tender Length 66 inches
Height 21-1/2 inches
Weight (Engine Only) 1,500+ pounds (approx)
Track Gauge 7-1/2 inches (can be modified for 7-1/4")
Bore & Stroke 2-3/4 x 3-1/2 inches
Lead/Trailing Wheels 5/5-1/4 inch diameter
Drive Wheel Diameter 10 inch diameter
Fuel Coal, Oil, or LPG
Boiler 12 inch diameter steel
Minimum Turning Radius 60 feet (50 feet Hudson)

 

Recommended machinery for building from rough parts:

16 inch swing lathe
Full size milling machine

 

Section One - ALCO Northern & Hudson

Part Quantity (H) Description of Part
FME-1 2 WATERJET CUT MAIN FRAME
FME2-1 2 (1) MAIN FRAME CROSS TIE #1
FME2-2 1 (1) BRAKE HANGER BRACKET #1
FME3-1 6 (4) MAIN FRAME CROSS TIE #2
FME3-2 2 (2) BRAKE HANGER BRACKET #2
FME4-1 1 (1) EXTENDED CRADLE

Section Two - ALCO Northern & Hudson

Part Quantity (H) Description of Part
DRW5-1 8 (6) AXEL/JOURNAL BOX
DRS7-1L 4 (4) LIGHT BOX-POC DRIVE WHEELS
DRS7-1M 2 (2) MEDIUM BOX-POC DRIVE WHEELS
DRS7-2H 2 (2) HEAVY BOX-POC DRIVE WHEELS
DRS7-2L 4 (4) LIGHT SPOKED DRIVE WHEELS
DRS7-2M 2 (2) MEDIUM SPOKED DRIVE WHEELS
DRS7-2H 2 (2) HEAVY SPOKED DRIVE WHEELS
MSP9-3 6 (4) EQUILIZER LEVER
MSP10-1 1 (1) BACK TRANVERSE EQUALIZER
MSP10-2 1 (1) FRONT TRANSVERSE EQUALIZER
FME10-10 2 (2) UPPER SPRING SEAT
FME10-10A 8 (6) SEALED BEARINGS

Section Three - ALCO Northern & Hudson

Part Quantity (H) Description of Part
FME11-1 1 (1) FRONT BUFFER & FRAME SPACES
BKE12-1 1 (1) BACK SUPPORT & BRAKE HANGER
BKE12-2 6 (6) BRAKE HANGER SUPPORT
BKE12-7 8 (8) BRAKE SHOE
BKE12-10 1 (1) BRAKE LEVER BELL CRANK
FME13-22 2 (2) BRAKE LEVER SHAFT BEARING
BKE13-27 1 (1) BRAKE CYLINDER
BKE13-28 1 (1) BRAKE CYLINDER REAR HEAD
BKE13-29 1 (1) BRAKE CDYLINDER FRONT HEAD

Section Four - ALCO Northern & Hudson

Part Quantity (H) Description of Part
TRL14-1 1 (1) TRAILING TRUCK FRAME
TRL4-9 2 (2) TRAILING TRUCK ROCKER
TRL15-3 4 (4) TRAIL TRK JOURNAL BOX
TRL15-4 4 (4) TRAIL TRK JOURNAL BOX COVER
TRL-15-4A 4 (4) TRAIL TRK BEARING
TRL15-4B 4 (4) TRAIL TRK WHEEL
LDG16-1 1 (1) LASER CUT LEAD TRK FRAME KIT
LDG16-2 4 (4) LEAD TRK JOURNAL BOX
LDG16-6 1 (1) LEAD TRK CENTER BOLSTER
LDG16-8 4 (4) LEAD TRUCK SWING LINK
LDG16-8A 4 (4) LEAD TRK BEARING
LDG16-8B 4 (4) LEAD TRK WHEEL

Section Five - ALCO Northern & Hudson

Part Quantity (H) Description of Part
CYL17-1 1 (1) CYLINDER BLOCK
CYL18-1 2 (2) STEAM CHEST
CYL18-2 2 (2) STEAM CHEST FRONT COVER
CYL18-3 2 (2) STEAM CHEST BACK COVER
CYL18-5 2 (2) SLIDE VALVE
CYL19-1 2 (2) VALVE STEM CROSSHEAD GUIDE
CYL19-2 4 (4) GUIDE BAR SPACER
ROD19-7 2 (2) CROSSHEAD
CYL20-1 1 (1) CYLINDER CENTER PLATE
CYL20-4 2 (2) BACK CYLINDER HEAD
CYL20-5 2 (2) FRONT CYLINDER HEAD
CYL20-7 2 (2) PISTON BLANK
CYL21-1 2 (2) FRONT CYLINDER HEAD COVER
CYL21-1A 2 (2) BACK CYLINDER HEAD COVER
CYL21-1A 4 (4) PISTON RING