Railroad Construction, Common MOW, Track, Structure, and Crossing Terms Explained
This glossary serves as a vital resource for understanding industry-specific terms that are crucial for railroad construction projects.
For any professional in railroad construction, having a solid understanding of this glossary will enhance your ability to communicate effectively on the job.
The glossary provides clarity on terms that are essential for daily operations, ensuring that everyone from project managers to new employees is on the same page.
Understanding this glossary is not only important for operational efficiency but also for ensuring safety in all railroad construction activities.
Railroad construction has its own language. From ballast and crossties to turnouts, frogs, culverts, and right-of-way, the terms used by railroad crews describe the parts, tools, work zones, safety rules, and infrastructure that keep rail systems operating.
This glossary explains common railroad construction and Maintenance of Way, or MOW, terms in plain language. It is designed for new employees, job applicants, industrial rail customers, project managers, and anyone trying to better understand how railroad track, structures, and crossings are built and maintained.
The Federal Railroad Administration’s Track Safety Standards are found in 49 CFR Part 213 and cover areas such as roadbed, track geometry, track structure, track appliances, and inspection. Railroad workplace safety rules under 49 CFR Part 214 are intended to help prevent accidents and casualties involving employees performing railroad inspection, maintenance, and construction work.
A
Alignment
This glossary can also serve as an educational tool for those looking to excel in their railroad careers.
The horizontal position of the track. Good alignment helps trains move smoothly and safely. Track alignment issues can create rough rides, excessive wear, or unsafe track conditions.
By familiarizing yourself with the glossary, you equip yourself with the knowledge needed for effective problem-solving in the field.
Anchor
A metal device fastened to the rail to help control rail movement. Rail anchors help prevent the rail from creeping or shifting under traffic.
Approach
The section of track or roadway leading into a bridge, crossing, turnout, or other feature. Approaches must be properly graded and maintained so the transition is smooth.
In railroad construction, a strong grasp of the glossary is vital for navigating the complexities of the industry.
Utilizing this glossary can greatly improve collaboration among teams working on railroad construction projects.
Referencing the glossary can reduce misunderstandings and enhance overall productivity in railroad construction tasks.
AREMA
AREMA stands for the American Railway Engineering and Maintenance-of-Way Association. AREMA produces railway engineering reference materials and recommended practices for railway infrastructure design, construction, and maintenance.
B
Ballast
The crushed stone placed under and around railroad ties. Ballast supports the track, helps distribute loads, promotes drainage, and keeps the track structure stable.
Ballast Deck Bridge
A railroad bridge with ballast and track structure carried across the bridge deck. This design can help maintain a more consistent track profile through bridge and crossing areas.
Ballast Shoulder
The section of ballast that extends beyond the ends of the ties. The shoulder helps hold the track in place and supports lateral stability.
Ballast Regulator
A machine used to shape, distribute, and clean up ballast along the track. It helps create proper ballast shoulders and clears excess stone from the track area.
Bridge Abutment
The structure at the end of a bridge that supports the bridge span and retains the approach embankment.
Bridge Cap
A horizontal timber, concrete, or steel member that helps support bridge stringers or other load-bearing components.
Bridge Deck
The part of a bridge that carries the track structure. Bridge decks may be open deck, ballast deck, timber deck, steel deck, or another design depending on the structure.
Bridge Pier
A support located between bridge ends. Piers carry loads from the bridge span down to the foundation.
C
Casing Pipe
A larger pipe installed under a railroad, road, or other obstruction to house a utility line. Casing pipes are common in jack-and-bore and utility crossing work.
Centerline
The imaginary line running down the center of the track. Surveyors, engineers, and construction crews use the centerline to lay out track location and alignment.
Clearance
The glossary is designed to streamline your learning curve in railroad construction.
The safe distance required around track, equipment, bridges, crossings, buildings, signs, and other objects. Railroad clearances are important because trains and equipment need room to operate safely.
Understanding the glossary will aid in your long-term success in railroad construction roles.
Closure Rail
This glossary can help you build a solid foundation for your railroad construction career.
A short section of rail used to connect track components, often within a turnout or special track layout.
Keep this glossary accessible for quick reference during your railroad construction projects.
Compromise Joint
A rail joint used to connect rails of different sizes or profiles. This may be needed when joining older track to newer rail sections.
Continuous Welded Rail, CWR
The glossary is a cornerstone of successful communication within the railroad construction community.
Long sections of rail welded together to reduce the number of joints. CWR can provide smoother operation but requires careful handling because rail expands and contracts with temperature changes. FRA Part 213 includes requirements related to continuous welded rail programs.
Keep this glossary handy as you navigate the challenges of railroad construction.
Crossing
A location where a road, driveway, pedestrian path, or another track crosses a railroad track.
Crossing Panels
The surface panels installed at a grade crossing so vehicles can pass over the track. Panels may be made of concrete, rubber, timber, asphalt, or other approved materials.
Our glossary ensures you remain informed about the terminology that shapes the railroad construction landscape.
Crosstie
Consult the glossary regularly for ongoing education and professional growth in railroad construction.
The horizontal support placed under the rails, often made of wood, concrete, or composite material. Crossties hold the rails in place, help maintain gage, and transfer loads into the ballast. FRA rules describe crossties as material to which rail can be securely fastened.
Culvert
A drainage structure that carries water under the track, embankment, roadbed, or access road. Culverts help protect the railroad from washouts and drainage problems.
Curve
A section of track that changes direction. Curves require proper alignment, elevation, gage, and maintenance to safely handle train movement.
D
Derail
A safety device designed to guide or stop unauthorized or uncontrolled rail equipment from entering a protected track area.
Diamond
A track crossing where two railroad tracks cross each other at grade. The shape of the crossing often resembles a diamond.
Drainage
The system that moves water away from the track structure. Good drainage protects ballast, roadbed, embankments, bridges, culverts, and the overall track structure.
Ditch
A drainage channel along the railroad right-of-way. Ditches help move water away from the track and roadbed.
E
Easement
A legal right to use or access land for a specific purpose, such as railroad operations, construction, maintenance, utilities, or drainage.
Embankment
A raised section of earth or fill material that supports the track above the surrounding ground.
Emergency Repair
Railroad repair work performed quickly after a failure, derailment, washout, storm damage, bridge issue, or other service-impacting event.
End Mismatch
A condition where the ends of two rails at a joint do not line up properly in height or position. FRA Track Safety Standards include provisions related to rail end mismatch.
F
Fastener
A device used to secure the rail to the tie or track structure. Fasteners may include spikes, clips, screws, anchors, plates, and other rail-securing components.
Field Weld
A rail weld made in the field, usually to join rail sections during construction, repair, or continuous welded rail work.
Flangeway
The open space beside the rail that allows a wheel flange to pass through a crossing, turnout, frog, or guard rail area. Flangeways must remain clear for safe wheel movement.
Frog
A track component used in turnouts and crossings where wheel paths intersect. The frog allows wheels to pass through the crossing point of two rails.
G
Gage
The distance between the inside faces of the two running rails. Standard gage in North America is 4 feet, 8.5 inches. Maintaining proper gage is one of the core responsibilities of track construction and Maintenance of Way crews.
Gage Rod
A rod used to help maintain track gage by connecting the rails. Gage rods are sometimes used in special or temporary conditions.
Grade
The slope of the track or roadway. Grade can refer to the vertical rise or fall of the track over a distance.
Grade Crossing
A place where a roadway and railroad track cross at the same level. Grade crossings may include signs, pavement markings, gates, lights, bells, crossing panels, and drainage features.
Guard Rail
A rail installed alongside a running rail to help guide wheels through bridges, crossings, turnouts, or other special track areas.
H
Hi-Rail Vehicle
A truck or vehicle equipped to operate both on roads and on railroad track. Hi-rail vehicles are commonly used for inspection, maintenance, repair, and field support.
Headwall
A structural wall at the end of a culvert or drainage pipe. Headwalls help retain soil and protect the culvert opening.
Highway-Rail Grade Crossing
A public or private location where a highway, road, or street crosses railroad track at the same level. FRA has a dedicated safety program for grade crossing safety and trespass prevention.
I
Industrial Siding
A track serving an industrial facility, warehouse, manufacturing plant, transload site, mine, terminal, or customer location.
Inspection
The process of checking railroad track, bridges, crossings, drainage, and related infrastructure for defects, wear, damage, or unsafe conditions. FRA Part 213 includes track inspection requirements.
Insulated Joint
A rail joint designed to electrically separate sections of rail, often used in signal systems and track circuits.
J
Jack and Bore
A trenchless construction method used to install casing pipe under railroads, roads, or other obstacles. A jacking system pushes the casing while boring or cutting removes material from the path.
Joint
The connection point where two pieces of rail meet. Joints may use joint bars, bolts, compromise bars, or other components.
Joint Bar
A metal bar used to connect two rail ends at a joint.
L
Line
The horizontal direction or alignment of track. Crews may refer to correcting “line” when adjusting track alignment.
Low Spot
A depressed area in the track surface or roadbed that may hold water or create rough track conditions.
M
Maintenance of Way, MOW
The inspection, repair, maintenance, and construction work needed to keep railroad track, bridges, crossings, drainage, and right-of-way infrastructure safe and reliable.
Mainline
A primary track used for through train movements. Mainline work often involves strict coordination, planning, and safety protection.
Material Staging
Organizing and placing materials near the work area before construction or repair begins. Good staging helps crews work efficiently and safely.
Mud Spot
An area where fine material, water, and ballast mix together, creating poor support under the track. Mud spots often signal drainage or subgrade problems.
O
On-Track Safety
Safety procedures used to protect workers from trains, on-track equipment, and other movements while working on or near track. FRA Roadway Worker Protection rules require railroads to adopt and implement on-track safety programs.
Open Deck Bridge
A bridge where the ties are directly supported by bridge members, with open space between ties instead of a full ballast deck.
Out-of-Face Work
A production-style maintenance or construction method where crews work continuously through a section of track rather than making isolated spot repairs.
P
Panel Track
A preassembled section of track made up of rails, ties, fasteners, and other components. Panel track can be installed quickly during construction or repair.
Plate
See Tie Plate.
Plug Rail
A short piece of rail installed to replace a damaged or removed rail section.
Private Crossing
A crossing that serves a private road, farm access, industrial facility, or private property rather than a public roadway.
Production Gang
A larger crew assigned to perform high-volume track work, such as tie replacement, surfacing, rail replacement, or other large maintenance projects.
R
Rail
The steel running surface that supports and guides train wheels. Rail comes in different sizes and profiles depending on use, age, and railroad standards.
Rail Anchor
See Anchor.
Rail Joint
See Joint.
Rail Relay
The process of replacing existing rail with new or reusable rail.
Rail Seat
The area where the rail sits on the tie plate, tie, or fastening system.
Railbound Manganese Frog
A heavy-duty frog commonly used in turnouts. Manganese steel is used because it can withstand high impact and wear.
Roadbed
The prepared foundation that supports the ballast and track structure. A stable roadbed is essential for safe, durable track.
Roadway Worker
A worker whose duties involve inspection, construction, maintenance, or repair of railroad track, bridges, roadway, signal and communication systems, electric traction systems, roadway facilities, or roadway maintenance machinery on or near track. FRA’s Roadway Worker Protection program focuses on protecting these workers from trains and equipment.
Right-of-Way
The railroad corridor that includes the track area and surrounding property used for railroad operations, access, drainage, utilities, signals, and maintenance.
S
Shoulder
See Ballast Shoulder.
Siding
A track connected to the main track or another track, often used for storage, loading, unloading, passing, or customer service.
Signal
A device or system used to communicate train movement authority, track conditions, crossing warnings, or other operational information.
Spike
A fastener traditionally used to secure rail or tie plates to wood ties.
Spot Repair
A localized repair made to a specific defect or problem area instead of working through a long section of track.
Stringer
A bridge member that runs in the direction of the track and supports bridge ties or deck components.
Subballast
A layer of material between the ballast and subgrade. Subballast helps distribute loads, improve drainage, and separate ballast from the underlying soil.
Subgrade
The natural or prepared ground beneath the track structure. The subgrade supports the roadbed, subballast, ballast, ties, and rail.
Surfacing
The process of raising, leveling, and aligning track to restore proper geometry and ride quality. Surfacing often involves tamping ballast under the ties.
Switch
A track assembly that allows trains or rail equipment to move from one track to another.
Switch Point
The movable rail section in a switch that directs wheels toward one route or another.
T
Tamp
To compact ballast under and around ties so the track is properly supported.
Tamper
A machine that lifts track and packs ballast under the ties. Tamping helps restore track surface and alignment.
Tie
Another term for crosstie.
Tie Plate
A steel plate placed between the rail and a wood tie. Tie plates help distribute load and hold the rail in position.
Tie Replacement
The process of removing old or damaged ties and installing new ties to restore track support and gage-holding ability.
Track
The complete railroad structure trains run on, including rail, ties, fasteners, ballast, roadbed, and related components.
Track Bolt
Empower yourself with knowledge through our detailed glossary of railroad construction terms.
A bolt used to fasten joint bars to rail ends.
Track Class
A classification that relates to allowable train speeds and track condition requirements. FRA Track Safety Standards include requirements organized by track class.
Track Geometry
The measurable shape and position of the track, including gage, alignment, surface, elevation, and curvature.
Track Panel
See Panel Track.
Track Rehabilitation
Work performed to restore or improve existing track. This may include tie replacement, rail replacement, ballast work, surfacing, drainage improvements, and other repairs.
Track Structure
The physical components that make up railroad track, including rail, ties, fasteners, ballast, and supporting materials. FRA Part 213 includes a subpart covering track structure, including ballast, crossties, defective rails, rail joints, tie plates, and rail fastening systems.
Track Surfacing
See Surfacing.
Turnout
A track arrangement that allows movement from one track to another. A turnout typically includes switch points, a frog, closure rails, guard rails, and other components.
W
Walkway
An area along the track intended to provide safer walking access for railroad employees or crews.
Washout
Damage caused when water washes away ballast, roadbed, embankment, or supporting material. Washouts can create serious track stability problems.
Welded Rail
Rail joined together by welding rather than by bolted joints. See Continuous Welded Rail.
Wing Rail
A rail component near a frog that helps guide wheel movement through a turnout or crossing.
Work Block
A planned period of time or track authority that allows crews to perform work in a protected track area.
Work Zone
The area where railroad construction, inspection, repair, maintenance, or crossing work is being performed.
Common Railroad Crossing Terms
Active Warning Devices
Signals, flashing lights, bells, and gates used to warn road users at a grade crossing.
Crossing Gate
A gate arm that lowers to block traffic when a train is approaching or occupying the crossing.
Crossing Surface
The driving surface installed between and around the rails at a roadway crossing. Common materials include concrete, rubber, timber, asphalt, or composite systems.
Flasher
The flashing light assembly at a grade crossing.
Grade Crossing Signal
A warning system used at a roadway crossing to alert drivers and pedestrians of train movement.
Passive Crossing
A crossing with signs or pavement markings but without active warning devices such as gates or flashing lights.
Public Crossing
A crossing where a public road crosses railroad track.
Road Approach
The roadway leading up to a grade crossing. Road approaches need proper grade, drainage, sight distance, and surface condition.
Common Railroad Structure Terms
Backwall
A wall at the end of a bridge or abutment that helps retain material behind the bridge seat.
Bent
A bridge support made up of piles, posts, caps, and bracing.
Bracing
Structural members used to stabilize a bridge, trestle, or other structure.
Cap
A horizontal member that sits on top of piles or posts and supports the bridge structure above.
Girder
A large horizontal structural member that supports loads across a span.
Pile
A vertical or driven structural member used to support a bridge, trestle, or foundation.
Span
The distance or bridge section between two supports.
Trestle
A bridge-like structure supported by a series of bents or frames, commonly used to cross low areas, streams, or uneven terrain.
Wingwall
A wall extending from an abutment to help retain soil and guide drainage near a bridge or culvert.
Common Crew and Safety Terms
Competent Person
A person with the training, experience, and authority to identify hazards and take corrective action. The exact meaning can vary by rule, company, and work type.
Foreman
The crew leader responsible for directing field work, communicating the work plan, coordinating tasks, and helping maintain safety and production.
Job Briefing
A safety and work-planning discussion before work begins or when conditions change. Job briefings help crews understand the work, hazards, protection, roles, and communication expectations.
Maintenance Crew
A crew assigned to inspect, repair, maintain, or improve existing railroad infrastructure.
PPE
Personal protective equipment. In railroad construction, PPE may include hard hats, safety glasses, high-visibility clothing, gloves, hearing protection, protective footwear, fall protection, or other required gear.
Roadway Worker Protection, RWP
A set of safety requirements and procedures designed to protect workers on or near railroad track from trains and on-track equipment. FRA states that RWP regulations require railroads to adopt and implement on-track safety programs.
Track Authority
Permission or authorization that controls use of a section of track. Work crews may need track authority or other protection before occupying certain track areas.
Watchman or Lookout
A trained person assigned under specific procedures to watch for approaching trains or equipment and warn workers when required.
Why These Terms Matter
Understanding railroad construction language helps new employees work more safely, communicate better, and learn faster. It also helps industrial customers, contractors, and project stakeholders understand what crews are doing in the field.
For job seekers, learning these terms can make the first few weeks on a railroad crew less overwhelming. For customers, it can make project planning and communication easier. For crews, shared language keeps the work moving without guesswork.
Ready to Work in Railroad Construction?
Capital Railroad Contracting hires hardworking people for railroad construction, Maintenance of Way, track labor, bridge work, equipment operation, CDL support, mechanic roles, and other field positions depending on project needs.
If you are dependable, safety-minded, willing to travel, and ready for physical outdoor work, railroad construction can be a strong career path.