Near Winnsboro in Fairfield County, South Carolina — The American South (South Atlantic)

How the Injector Works

South Carolina Railroad Museum

Photographed by Devry Becker Jones (CC0), January 18, 2026

1. How the Injector Works Marker

Inscription.
For some background, all locomotives were required to have two methods of inserting water into the boiler, one of which being the feedwater heater, and the other being the injectors. Both methods were required to be independent from each other for safety reasons.

The injector is a unique piece of technology. Think of it like a can of spray paint- the steam forces the cold water into the boiler, just as air forces paint out of a spray paint can.

Erected by South Carolina Railroad Museum.

Topics. This historical marker is listed in this topic list: Railroads & Streetcars.

Location. 34° 20.418′ N, 81° 4.767′ W. Marker is near Winnsboro, South Carolina, in Fairfield County. It is on Industrial Park Road (State Road 20-34) south of State Route 34, on the right when traveling south. Touch for map. Marker is at or near this postal address: 110 Industrial Park Rd, Winnsboro SC 29180, United States of America. Touch for directions.

Regionally, this marker is in the Midlands

and in the Olde English District. It is also in the American South

and specifically in the

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Deep South.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once the territory of the Mississippian Culture,

one of the original Thirteen Colonies,

one of the Confederate States of America,

and the Antebellum South.

Other nearby markers. At least 8 other markers are within 3 miles of this marker, measured as the crow flies: Hampton and Branchville #44 (here, next to this marker); The operation of a steam locomotive (a few steps from this marker); Southern Railway Pullman "Bizet" (within shouting distance of this marker); Thomas Woodward (approx. 1.1 miles away); Stephen Greene Memorial Garden Armed Forces Memorial (approx. 1½ miles away); Fairfield Institute / Kelly Miller (approx. 2.4 miles away); Cathcart-Ketchin House / Catharine Ladd (approx. 2.6 miles away); Saint John's Episcopal Church (approx. 2.6 miles away). Touch for a list and map of all markers in Winnsboro.

Nearby plaque image. Click for full size.

Photographed by Devry Becker Jones (CC0), January 18, 2026

2. Nearby plaque

How The Steam Chest Works The steam chest is one of the most important pieces of equipment on a steam locomotive. The steam chest is actually what distributes the steam into the cylinders and causes the locomotive to move. It is connected to the piston rod and valve stem which actuate the steam valve. Notice how steam is both in front of and behind the piston. The valve spool and stem are what control the flow of exhaust and live steam through the cylinder. In simple terms, the steam chest is where steam moves the piston, which turns the wheels.

Credits. This page was last revised on January 25, 2026. It was originally submitted on January 25, 2026, by Devry Becker Jones of Washington, District of Columbia. This page has been viewed 31 times since then. Photos: 1, 2. submitted on January 25, 2026, by Devry Becker Jones of Washington, District of Columbia.