SP's Sacramento shop facilities made just about everything.

Outside of the locomotive shops, there were the following...

The foundry made all things cast for all types of services. Brass whistles and bells for locomotives, cast iron appliances like smokestacks and firebox doors, cast steel parts like marker light brackets for passenger cars and cabooses.

Blacksmith shop made all things that needed to be forged and formed. Grab irons for rolling stock, pipe brackets, tools

The sheet metal shops made everything from tin cups for engine crews to drink from, kerosene lanterns, oil cans, new sheet metal roofs for passenger cars, toilet discharge chutes. All items made in the shops were embossed with S.P.Co on it. Heck, I've got a garbage can of all things made by the Sac shops.

There was a plating shop that would galvanize all the sheet metal parts as well as nickel plate all the things that needed to be shiny.

An upholstery shop made cushions for office chairs, bedding for sleeping cars, seat cushions for coaches.

A carpentry shop for making frames for all the things the upholstery shop made, the tongue and groove wood slats that lined steam locomotive cabs, and all the fancy trim that went into passenger cars.

The paint shop would buy or make any paint or varnish the shops needed. They would paint all things big and small.