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Specifications & Dimensions

One of the major issues in modeling this engine accurately from an Aristocraft C16 drive train is the matter of scale. The table further down this page specifically compares actual takeoffs from:

	NPC #1- Actual dimensions published in the Baldwin 1876 catalog and in publications on the North Pacific Coast.
	Aristo - Actual takeoffs from the Aristo C-16, a 1:24 scale model of a Baldwin Consolidation
	1:24 - Conversions from actual published dimensions in the Baldwin catalog where available. Otherwise they are actual takeoffs from David Fletcher drawings in SteamClass 2001 of a 1:24 Baldwin 8-16D in rescaled to 1:24 using the Raildriver ScalePrint utility using an 8-18D wheelbase.
	1:20.3 - Conversions from actual published dimensions in the Baldwin catalog where available. Otherwise they are actual takeoffs from David Fletcher drawings in SteamClass 2001 of a 1:20.3 Baldwin 8-16D in rescaled to 1:20.3 using the Raildriver ScalePrint utility using an 8-18D wheelbase.

1:24 scale drawing of a modernized Baldwin Mogul. Drawings courtesy of David Fletcher.

1:20.3 scale drawing of a modernized Baldwin Mogul. Drawings courtesy of David Fletcher.

Table of takeoffs:

Dimension	NPC #1	Aristo	1:24	1:20.3
Driver Diameter	40"	1.46"	1.67"	1.97"
Fixed Wheelbase	11'8"	5.22"	5.83"	6.90"
Overall Wheelbase	17'8"	8.5"	8.83"	10.44"
Length - Frame to Front Beam		11.5"	11.25"	13.75"
Cylinders	12x18
Truck Wheel Diameter	24"	0.78"	1.00"	1.18"
Cylinder Length - Outside		1.25"	1.38"	1.55"
Cylinder Diameter - Outside Middle		0.88"	1.00"	1.18"
Steam Dome Diameter		1.25"	1.21"	1.43"
Sand Dome Diameter		1.13"	0.81"	0.97"
Diamond Stack Height		2.50"	2.60"	3.25"
Boiler Diameter			1.77"	2.10"
Boiler/Smokebox Length			6.93"	8.13"
Smokebox Length			1.02"	1.30"
Cab Height - Sides			2.53"	3.50"
Cab Height - Roof			2.96"	4.20"
Cab Length -Sides			2.29"	3.29"
Cab Length - Roof			3.75"	5.23"
Height at Cab Roof			4.86"	6.40"
Height at Boiler			3.43"	4.06"
Height at Steam Dome			5.14"	6.04"

A comparison of the specifications shows that the Aristo drive train dimensions are much closer to the prototype at 1:24 than at 1:20.3. At 1:24, measurements on overall wheelbase and overall frame length is nearly right on. Overall fixed wheelbase is a bit higher on the prototype. I suspect the Aristo is modeled after a 8-16D while the prototype is an 8-18D with larger cylinders and a longer wheelbase. The difference in driver diameters is most likely due to the fact the NPC engine ran 40" drivers while the Aristo engine was modeled after an engine with 36" drivers.

At 1:20.3 many of the dimensions are off by significant amounts. At 1:20.3, I suspect the model wouldn't be convincing. If the Aristo drive train is to be used as the base drive train for this bash, NPC No 1 should be modeled in 1:24 scale.

Specifications & Dimensions

(c) 2007 Iron Horse 1:29