As individual components of railroad infrastructure go railroad track, or rails, is the single most important part.

While the ballast and ties also play a very important role within the track structure, without the rails, of course, trains could not operate.

Throughout the decades and centuries railroad track technology has gradually improved with the most important advancement coming in the development of "T"-rail in the mid-19th century.

Today, virtually all main lines with speeds above 25 mph use welded or continuous welded rail (CWR) as it is much easier to maintain than the older "stick" or jointed rail that required being bolted together.

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A closeup view of 136-pound welded rail along the former Baltimore & Ohio"s West End near Hancock, West Virginia taken on March 11, 2007. To the left is the rail"s weight followed by the manufacturer and date it was produced. Rob Kitchen photo.

The earliest aspects of railroad infrastructure are, of course, the track and roadbed.

Railroad track, as with railroading itself, has its roots in England where years coal mines had been using horses or mules to pull carts that used flanged wheels to operate on wooden or strap-iron rails (which was essentially a wooden rail with a piece of flat iron attached to the top).

This type of track remained in use as late as the 1840s (by this point strap-rail was the norm) until solid iron "T"-rail was developed by Robert Stevens president of the Camden & Amboy Railroad, it was a revolutionary design still used to this day. 

The "T"-rail replaced the unstable and dangerous strap-rail (which was simply thin pieces of iron attached to wooden planks) that caused the deadly phenomenon of "snake heads."

This term described iron strap that came loose behind  passing car/locomotive and peeled upward.

The result was a can opener-like effect when the next car passed over the broken rail as it easily tore through the wooden floor, killing or maiming anyone in its path.

Other Types Of Infrastructure

Ballast, Supporting The Rails And Ties 

Coaling Towers, Keeping Steam Locomotives Fueled Railroad Bridges, The Types And Their Histories The Ties, Supporting The Rails Tunnels, Conquering The Mountain The Yards, Sorting And Classifying The Roundhouse, Once The Realm Of Steam The Turntable, Turning Locomotives 

The Western Maryland"s Connellsville Extension was still in excellent condition when Roger Puta captured this photo from train WM-6 on August 16, 1969. The route was abandoned in 1975.

Throughout most of the 19th century iron was the primary choice for railroad track and every other structure being built. However, in the 1890s the much stronger and durable steel was introduced.

Steel was not only much stronger than iron but because it had a longer lifespan railroads were willing to pay a little more for it as in the end it meant an improved bottom line. 

It was not until the 1950s that railroad track would see another major change.

That decade saw the first use of continuous welded rail (CWR), also known as ribbon rail, which is laid in lengths of 1,500 feet or so (roughly a 1/4-mile), rather than 39-foot track bolted together.

Aside from saving railroads millions in maintenance costs and derailments CWR does not buckle, because it resists thermal expansion and contraction.

When track is not properly maintained it begins to sink into the ground as a result of rotten ties as seen here at the Erie Lackawanna"s yard in Marion, Ohio during March of 1976. Gary Morris photo.
Roger Puta captured this scene along the Burlington Northern main line at Castle Rock, Washington in October, 1978.
Roger Puta captured this photo from the fireman"s side of the cab of Santa Fe F7A #306-L leading train #2, the eastbound "San Francisco Chief," negotiating Tehachapi Loop on August 26, 1967. Note the freight train above.

During the late 19th century railroad track could weigh less than 80 pounds (typically measured per yard) but as the decades passed and locomotives and cars grew larger the rails have had to follow.

Today, the major rail arteries around the country employ track that weight at least 120 pounds but some can weight up to 140 pounds.

Interestingly, relics can still be found out there, particularly on tourist railroads that can contain railroad track dating back to the late 1800s and be no heavier than 90 pounds.

What years of deferred/no maintenance look like; decaying ex-Chicago & North Western trackage near Hamburg, Minnesota on August 18, 1994. The property is still in service today, operated by the Minnesota Prairie Line. Doug Kroll photo.

Today, with trains so heavy and the required weight of the track now well in excess of 100 pounds new rail can be very expensive so when purchasing it railroads try to closely match it with whatever type of service it is intended for.

For instance, if a rail line only sees short or infrequent trains such as on branch lines these typically are not as heavy as long coal drags, which will, naturally, require much heavier rail.

In any event, early railroad track has given way to the much heavier and more comfortable (in terms of the ride) ribbon rail.

And, CWR has become a science into itself as railroads must make sure they install the rail correctly and in warm enough temperatures to keep kinking from occurring.

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Electro-Motive Database

In 1998 a gentleman by the name of Andre Kristopans put together a web page highlighting virtually every unit every out-shopped by General Motors" Electro-Motive Division. 

Alas, in 2013 the site closed.  However, Don Strack rescued the data and transferred it over to his site (another fine resource). 

If you are researching anything EMD related please visit this page first.  The information includes original numbers, serials, and order numbers.