Code 3881 applies to employers engaged in manufacturing, repairing, rebuilding or dismantling railroad cars.  The railroad cars manufactured may be passenger type cars, steel tank cars or gondola cars.

Operations contemplated by this classification include the manufacturing of steel frames for the car bodies which may involve work such as shearing, punching, pressing, forming and fabricating under-frames or chassis and steel plate work such as cutting, fitting, bolting, riveting or welding, and machining parts such as turning axels, boring wheels, drilling and assembly of car fittings, etc. 
 
The operations will differ somewhat between manufacturing railcars and renovating them.  When an employer receives a railcar to be refurbished, they will jack up the car on stands to be worked upon.  In some cases, it is not necessary for the employer to work under the railcar.  The employer will then proceed to dismantle the cars by removing old seats, fixtures, doors, windows, controls, heating and cooling units, handrails, furniture, etc.  After the employer has removed the required fixtures and furnishings, the employer will then install new electrical, plumbing, heating and cooling systems.  The employer will add the necessary lighting fixtures, plumbing fixtures and control panels with the systems being wired and pipe connections made.

The interior of the railcar is finished by adding seats, handrails, windows, doors, weather-stripping and moldings.  For sleeper cars, pre-made fiberglass sections are inserted into the body of the railcar, slid in place and secured.  For dining cars, the employer will add the required tables, chairs and bars.  The employer will then secure the refurbished truck and wheel assemblies to the underside of the railcar and if required, electric traction motors are added.  The railcar is then taken to the paint area in which the railcar is spray painted, dried and decals added.  The finished railcar is taken to a test building in which the railcar is sprayed with water to test for leaks.  The completed railcar is inspected, loaded onto common carrier trucks for return to the customer or are taken by rail back to the customer.