How to Find Historic Railroad Construction Camps to Metal Detect: The Forgotten Frontier of American Railroads

During the great age of railroad expansion in the United States—from roughly the 1850s through the early twentieth century—railroad companies pushed thousands of miles of track across the country. Today, many people associate railroad history with towns, depots, and locomotives, but long before those permanent structures existed, the people who built the railroads lived in temporary settlements that followed the advancing construction crews across the landscape.

These settlements were known as railroad construction camps, and they were the mobile frontier of railroad expansion. Survey crews first mapped possible routes across the terrain. Grading crews followed, cutting through hillsides, leveling ground, and building embankments across valleys. Bridge crews constructed trestles and crossings over rivers and ravines. Finally, track gangs installed ties, rails, and spikes to complete each section of the line.

Every stage of this work required large numbers of laborers living close to the construction site. Railroad companies, therefore, established temporary camps along the advancing rail grade. These camps typically consisted of canvas tents for workers, cookhouses where meals were prepared, blacksmith forges used to repair tools and shoe animals, supply wagons bringing equipment from nearby towns, and picket lines where mules and horses were tied between work shifts.

The length of time a construction camp remained in one location depended on the type of work underway. Track-laying crews could move very quickly. Historical records describe gangs laying one to three miles of rail in a single day under ideal conditions. Camps supporting those crews sometimes remained in one place only a few days before moving forward with the rails. Grading camps usually stayed longer because leveling the land required heavy labor. They would cut through hills or fill ravines, and were in place for several weeks or months at a time.  Bridge construction camps often remained the longest of all, sometimes staying several months while foundations and trestles were built.

Life in Railroad Camps

Life in these camps could be rough but lively. Most workers were young men earning cash wages, and their off-duty activities reflected the frontier culture of the time. Gambling was common, with card games such as poker, faro, and monte played in tents or makeshift saloons. Alcohol was widely available, often supplied by traveling merchants who followed construction crews. In larger camps, dance halls or “sporting tents” sometimes appeared where entertainers and prostitutes worked. Because of this activity, many railroad camps became known by the nickname “Hell on Wheels.”

The temporary nature of these camps often left behind concentrated archaeological deposits. When the railroad moved forward, many items were discarded rather than packed and transported. Workers frequently threw refuse downhill from the camp area, creating informal dumps filled with bottles, tin food cans, broken tools, and everyday items. Detectorists who know about these hidden honey holes commonly recover objects such as whiskey bottles, sardine tins, suspender clips, boot eyelets, mule shoes, lantern parts, and wagon hardware from these sites. Because camps sometimes existed only briefly, these artifacts are often buried only a few inches beneath the surface.

How Railroad Routes Were Chosen

Railroad routes were not determined randomly. Engineers had to design routes that locomotives could climb without losing power. Because early steam locomotives could not handle steep grades, railroads typically followed routes that allowed gentle slopes and gradual curves. Engineers looked for natural corridors such as river valleys, mountain passes, and rolling terrain where the railroad could maintain a steady elevation.

Water sources were also important. Steam locomotives required large quantities of water, so railroads often followed routes where creeks, springs, or rivers could supply regular water stops. Construction cost played a major role as well. Railroads tried to avoid routes that required expensive bridges, tunnels, or deep cuts through rock formations.

As railroads expanded across the landscape, their corridors created long, straight lines cutting through forests, plains, and mountains. These corridors often remain visible today, even if the tracks themselves have been removed.

When Towns Gambled on the Railroad

The coming of a railroad was one of the most powerful economic forces in nineteenth-century America. Communities competed fiercely to attract a rail line because towns with depots gained access to markets, freight shipments, and passenger travel. Knowing this, landowners and town promoters sometimes platted towns in advance of the railroad, hoping the line would pass through their property.  Additionally, the railroad Companies themselves would claim vast swaths of land to sell to settlers as well as investors.

These speculative townsites often included surveyed streets, lots for businesses, and public land donated for churches, schools, and cemeteries. A general store might be constructed, and sometimes a church or school building would be erected to give the appearance of a growing community. If the railroad did indeed arrive, the town could prosper overnight.

But if the railroad chose a different route—even just a few miles away—the consequences could be severe. Businesses and residents often relocated closer to the tracks where trade and transportation were available. In some cases entire towns physically moved toward the railroad.

What remained behind were fragments of the original settlement: a cemetery, a church foundation, scattered debris from homes and stores, and sometimes an old grove of trees that once shaded a town square. Today these remnants can be found in the middle of ranch land or farmland, belonging to communities that disappeared long ago.

The Scale of Abandoned Railroad Corridors

At its peak around 1916, the United States had roughly 254,000 miles of mainline railroad and about 430,000 miles of total track including sidings and yards. Today the active network has shrunk to about 140,000 miles of rail line. That means roughly 100,000 to 120,000 miles of railroad corridors have been abandoned or removed across the country.

Many of these former corridors still exist on the landscape. Some appear as overgrown railroad grades through forests and fields. Others have been converted into recreational trails or utility corridors. Even when the rails are gone, the earthworks built by nineteenth-century engineers remain visible.

Below is a map of abandoned railroad tracks and railbeds.  Likely it is not totally complete, but it gives you an idea of where to look.  We will discuss the how to shortly.

Here is an approximate breakdown of those abandoned corridors: 

1. Completely Abandoned Lines where rails were removed 70,000 to 90,000 miles
2. Rails to Trails Conversions 26,000 miles in the U.S. such as the Katy Trail in Missouri with 240 miles, Cowboy Trail in Nebraska with a planned 321 Miles, and the Minuteman Bikeway in Massachusetts with 10 miles.  The list goes on in virtually every state.
3. Railbanked Corridors, for example, from 1983 until 2008, about 14,000 miles were abandoned, and many were proposed for railbanking agreements.

For metal detectorists and historical researchers, this massive reduction in rail mileage represents an overlooked opportunity. Over the past hundred years the United States railroad system has lost roughly forty percent of its peak network, and with that loss came the abandonment of thousands of associated sites. Along those forgotten corridors once stood construction camps, bridge camps, railroad towns that vanished, abandoned depots, and old sidings or loading areas where freight and passengers once gathered. Most of these locations were active between 1870 and 1930, which places them squarely within one of the most productive historical periods for metal detecting and artifact recovery.

To put the scale of this abandoned infrastructure into perspective, if all of the former railroad corridors in the United States were laid end to end, they would stretch far enough to circle the Earth roughly four times.

Seeing Railroads in the Landscape Today

I want to share with you a way to easily find that abandoned railroad pathway so you can go exploring for treasures.  As a caveat as in all of my articles, you must have permission to go on private land.  OK, here we go….

There are several sites online that feature abandoned railroad tracks.  The most important one is located here:  https://www.frrandp.com/p/the-map.html .  You can use this interactive map on a pc, or download a mobile version.  You can zoom in and out as well.  It is a great resource to use for first finding, and then examining the results on LiDar.

Here is what I suggest to use as a workflow:

First, find an area where you want to examine the abandoned railway.  In this example, I am going to use a Texas based area (Megagerl, Tx) because I know that cattle were loaded onto boxcars for shipping back east back in the day.

I chose Megagerl for this illustration because I wanted to show a couple of things on LiDAR imaging to you.  The orange line is the abandoned railroad bed from the interactive map.  We are actually going to go just a bit out of Megagerl up by Westover, and I am going to show you the image first in Google Earth, then in LiDAR from the National Map located at https://apps.nationalmap.gov . 

The Google Earth image shows a fairly nondescript view of the area, and the LiDAR image shows clearly where a trestle was, along with the abandoned railroad bed.  It also shows the stock pens, which still exist, but were also used back in the cattle days to load livestock before shipping.  This also introduces the other possibility that, around those pens in years gone by, cowboys hung out and lost things.  A creek and an FM road are also present.  You can copy those coordinates to use in both sites.  33.505578, -99.030739 . 

Now, let’s talk about the LiDAR aspect. 

One of the most powerful modern tools for identifying abandoned railroad routes is LiDAR terrain imaging. LiDAR uses laser scanning to create highly detailed elevation models of the landscape. Because the technology can filter out vegetation, it reveals subtle earthworks that are invisible in ordinary aerial photographs.

In LiDAR imagery, abandoned railroad grades often appear as long, flat terraces cutting across hillsides or as raised embankments stretching across valleys. Engineers built these features to maintain a steady slope for locomotives, and those earthworks can remain visible more than a century after the railroad itself disappeared.

There are five very distinctive shapes that abandoned railroads leave in LiDAR imagery (one of them looks like a “railroad fingerprint”), and once you know them you can locate forgotten railroads anywhere in the country in minutes.

What you’re about to learn is one of the most useful things for finding old railroad features with LiDAR or shaded-relief terrain models. Railroads were engineered with strict limits on slope and curvature, so they leave very distinctive geometric signatures on the landscape. Even when the rails are gone and the corridor is covered in trees, these shapes remain visible in LiDAR data.

Below are the five most common “railroad fingerprints” visible in LiDAR imagery. Once you recognize them, you can often identify abandoned railroad corridors anywhere in the United States within seconds.

1. The Long Linear Terrace (Classic Railroad Grade)

What it looks like is a long, nearly straight line cutting across hillsides or through forests. In LiDAR it appears as a flat terrace or bench.

Why it forms – Railroads required very gentle slopes (often less than 2% grade). Engineers therefore cut a flat bench across hillsides so locomotives could maintain steady speed.

What you are likely to  find are construction camps nearby with the spikes and hardware, sidings, and water stops.

2. Cut-and-Fill Earthworks

What it looks like is that one side of the corridor appears as a steep cut into a hill, while the other side forms a raised embankment.

Why it forms – Excavated soil from the hillside cut was used to build the fill across nearby low areas.

What you might find is grading camps, blasting debris, tool fragments, and wagon roads used by grading crews

3. The Railroad Curve Signature

What it looks like is a perfectly smooth arc cutting across terrain.

Why it forms – Railroad curves were engineered with large radii so locomotives could safely maintain speed.  Natural trails and wagon roads rarely produce curves this smooth, which makes railroad alignments easy to recognize.

What you might find are, signal locations, maintenance camps, and track gangs working the curve.

4. The Bridge Approach Fingerprint

What it looks like is it has two long straight embankments leading toward a creek or river crossing.  Often the bridge itself is gone, but the approach ramps remain.

Why it forms – Railroads had to maintain grade when crossing water, so engineers built long raised approaches leading to trestles or bridges.

What you are likely to find are, bridge construction camps, blacksmith areas, tool dumps, and heavy iron fragments.

It is worthwhile to note that Bridge camps are often the richest railroad artifact sites.

5. The “Ghost Town Switch”

What it looks like is short spur line branching off the main railroad grade.  These often lead to depots, loading platforms, and small towns that vanished

Why it forms – Railroads built sidings so trains could load freight or allow trains to pass.

What you might find are depot locations, town sites, store areas, and boarding houses.

Why Railroads Are So Easy to See in LiDar

Railroads were engineered to maintain very gentle slopes, follow smooth curves, and avoid steep terrain.  This means their grades form unnaturally precise shapes in the terrain. Even after 100–150 years, those shapes remain visible because the earthworks are still present.  In the LiDAR image above, you can see those aspects, and once you understand how easy they are to find, you can get busy and locate your own treasure trove from the golden era of railroads.

A Hidden Layer of American History

Between the mid-nineteenth century and the early twentieth century, railroad construction transformed the United States. Thousands of miles of track were built across plains, forests, deserts, and mountains. Each mile required crews of workers who lived in camps that moved steadily across the country with the advancing rails.

Many of those camps vanished from the historical record when construction moved on. Some towns grew from these early settlements, while others faded away when the railroad passed them by. Today, the quiet traces of that era still remain along old railroad grades, in forgotten cemeteries, and in abandoned townsites scattered across the American landscape.

For metal detectorists, these sites offer a glimpse into the daily lives of the workers who built America’s railroads—and into the communities that rose and fell along the path of those iron rails.  They also offer you a new way to find your own treasures.  Can you hear those trains of yesteryear?  They are ready to punch your ticket to success!