"Classified Repairs"

[nw-mailing-list at nwhs.org]

Here are several examples of repair classifications
and may be a partial answer to the evolution question.
 There's not much difference between the sources.

USRA (1918)

Class 1
New boiler of back end
Flues new or reset
Tires turned or new
General repairs to machinery and tender

Class 2
New firebox or one or more shell courses or roof sheet
Flues new or reset
Tires turned or new
General repairs to machinery and tender

Class 3
Flues new or reset (superheater flues may be excepted)
Necessary repairs to firebox and boiler
Tires turned or new
General repairs to machinery and tender

Class 4
Flues part or full set
Light repairs to boiler and firebox
Tires turned or new
Necessary repairs to machinery and tender

Class 5
Tires turned or new
Necessary repairs to boiler, machinery and tender
including one or more pairs of refitted driver
bearings

General Repairs to Machinery
Drivers removed
Tires turned or changed
Journals turned if necessary
All driving wheel boxes and rods overhauled for a full
term of service


AAR (1924)

Class 1
New boiler or back end
Flues new or reset
Tires turned or new
General repairs to machinery and tender

Class 2
New firebox or one or more boiler shell courses new,
or wrapper sheet new
Flues new or reset
Tires turned or new
General repairs to machinery and tender

Class 3
Flues new or reset (superheater flues may be excepted)

Necessary repairs to firebox and boiler
Tires turned or new
General repairs to machinery and tender

Class 4
Flues part or full set
Light repairs to boiler and firebox
Tires turned or new
Necessary repairs to machinery and tender

Class 5
Tires turned or new
Necessary repairs to boiler, machinery and tender
including one or more pairs of refitted driver
bearings

General Repairs to Machinery
Drivers removed
Tires turned or changed
Axle journals turned if necessary
All driving wheel boxes and rods overhauled and
bearings refitted
Other repairs needed for the locomotive to perform a
full term of service


N&W (date unknown, from Tom Dressler)

Class 1
New boiler of back end
Flues new or reset
Tires turned or new
General repairs to machinery and tender

Class 2
New firebox or one or more shell courses or roof sheet
Flues new or reset
Tires turned or new
General repairs to machinery and tender

Class 3
Flues new or reset (superheater flues may be excepted
but were replaced as needed)
Necessary repairs to firebox and boiler
Tires turned or new
General repairs to machinery and tender

Class 4
Flues part or full set
Light repairs to boiler and firebox
Tires turned or new
Necessary repairs to machinery and tender

Class 5
Light repairs to boiler and firebox
Repair or renew flues where necessary
Drop main drivers and other drivers where necessary
refit boxes, take up excess lateral motion
Overhaul rods, valve gear, spring and brake rigging,
guides, pistons, engine and trailing trucks


N&W (1935)
See Gordon Hamilton’s article in Sept/Oct issue of The
Arrow, referenced earlier on this thread

Dave Stephenson

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