How to Say "rail" in Spanish
The most common Spanish word for “rail” is “vía” — use this word for the single metal track that a train runs on, or a specific track number in a station.
vía
Examples
El tren a Sevilla sale de la vía número dos.
The train to Seville leaves from track number two.
barra
BAH-rrah (Roll the 'rr' sound strongly)ˈba.rra

Examples
El ladrón usó una barra de hierro para abrir la caja fuerte.
The thief used an iron bar to open the safe.
Compramos una barra de pan integral.
We bought a loaf of whole wheat bread. (A long, stick-like loaf)
Metaphorical Extension
The word 'barra' is used for anything long, straight, and solid, including a loaf of bread ('barra de pan') or a stick of makeup ('barra de labios').
carril
kah-REELkaˈril

Examples
El tren se mantiene sobre los carriles de acero.
The train stays on the steel rails.
El nadador más rápido está en el carril cuatro.
The fastest swimmer is in lane four.
El cajón no cierra bien porque se salió del carril.
The drawer doesn't close well because it came off the slide.
Specific Parts
While 'vía' refers to the whole train track system, 'carril' refers specifically to the individual metal bars.
Swimming lanes
Mistake: “Estoy en el camino 5.”
Correction: Estoy en el carril 5.
banda
BAHN-dahˈbanda

Examples
El balón salió por la banda y fue saque de esquina.
The ball went out over the sideline and resulted in a corner kick.
Al otro lado de la banda del río hay una pequeña casa.
On the other side of the riverbank, there is a small house.
Necesitas golpear la bola contra la banda para meterla.
You need to hit the ball against the rail (of the table) to sink it.
Side of a Field
When talking about the edge of a playing area like a soccer pitch, 'banda' is the standard word.
Confusing 'vía' and 'carril'
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