Coach 2 Parts Numbering System

The purpose of this set of drawings was to be able to identify where parts were located and to some degree show size and shape of the individual parts in preparation of disassembly and restoration of Coach 2. Each part would have a unique number except for parts with no individuality such as the ceiling lath.

In preparation of for this endeavor I contacted a few people involved in restoration about numbering systems for projects of this type. I recall that the London Bridge was disassembled and each stone was numbered, then it was reassembled in Lake Havasu City. So I thought there would some standard. The best answer I got was "How about 1, 2, 3, 4,."

Such a numbering system would require a very detailed 3D map of the car showing each individual part and it's relationship with adjoining parts. My goal was to make it possible to look at a part and its number and have a very good idea where in the car the part was located and its purpose, with otherwise limited documentation.

So I took a page from the Navy's book of identifying ship compartments by frame number. I numbered the rafters from end (A) to end (B) of the car. Parts are given a letter code as to its function then numbered by the frame it is on or the lower number of the two frames it is between. If the part spans more than one frame it is numbered by the frame number it starts in. Then it is given an odd or even number according to which side it is on. For example SC4.2 indicates this is a stile cap on frame 4 and the even side of the car. The opposite side would have SC4.1. SC4.3 would be on the same side as .1 and .4 would be on the side with .2. Parts on the centerline are marked with a 0. Unfortunately I was not entirely consistent with this plan. For example I have labeled some parts LP(A).2A, LP(A).2B, LP(A).2C, LP(A).2D. These are a series of boards that make up the lower panel on the (A) end even side of the car. But individual boards are labeled .2A; .2B; .2C; and .2D instead of.2; .4; .6; .8 as was the original plan. Another deviation is the iron truss rod and associated parts. There are only four of these in or near the four corners of the car. The parts near the (A) end are numbered 1 and 2 maintaining the odd even side of the car rule. It follows that the (B) end parts are then numbered 3 and 4.

The ends of the car was marked as (A) or (B) instead of a frame number, the parentheses are to separate the end designator from the part code. .

Names for parts were derived from several sources. Two that I remember are Workbench Magazine August 2000 for its "Anatomy of Wainscoting" and "Passenger-car Maintenance Instructions Volume II - Carbodies" a TRAIN publication, Nov. 1990. I tried not to make up too many names.

Below is a list of part identifier codes.

AB auxiliary brace
B brace
BB belt band
BR bottom rail
BTR belt rail
CB compression brace
CLP ceiling lower panel
CM crown molding
CR cap rail
CRM ceiling reveal molding
CRM ceiling middle rail
CS ceiling stile
CUP ceiling upper panel
CV ceiling vent
D door
DF door frame
DW door window
FS furring strip
IT iron truss
LP lower panel
MB main brace
MP middle panel
PR panel rail
R rafter
S stile
SC stile cap
SS side sill
TR top rail
UP upper panel
W window
WF window frame
WS window sill
XLP exterior lower panel
XMP exterior middle panel
XTR exterior top rail

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