The preposition "tras"
Has the basic meaning of:  after, behind.
 TRAS is equivalent to: detrás de, después de.
Tu auto está tras el mío. Your car is behind mine.
Tu auto está detrás del mío. Your car is behind mine.
En la cola, yo estaba tras de ti. On the line, I was behind you.
En la cola, yo estaba después de ti. On the line, I was behind you.
The Spanish preposition tras, usually meaning "behind" or "after," isn't a particularly common preposition. 
in Spanish means always following after, either in space or time,
En español tras siempre implica posterioridad, ya sea en el espacio o en el tiempo,
 and it indicates a repetition: 
Caminaban uno tras otro.  They walked one after (behind) the other.
Los aviones salieron uno tras otro. The airplanes left one after another. 
In fact, you could probably get by without even using it, as the prepositional phrases detrás de ("behind" in location) 
and después de ("after" in time) can usually be used instead. Tras is more common in writing than in speech.
Even so, tras has significant use in journalese (it's a shorter word to use in headlines) and in a few phrases such as
uno tras otro.  one after the other.
día tras día.  day after day.
tras la verdad. after truth.
tras de ti. after you.
Here are the most common meanings of tras, along with examples of its use:
After (in time): 
Se degradó la libertad de prensa tras la elección.  Freedom of the press was diminished after the election.
El restaurante abre nuevamente tras ser cerrado.  The restaurant is opening again after being closed.
Tras el otoño viene el invierno. After autumn comes winter.
Tras este tiempo vendrá otro mejor. After this time will come a better one.
After (in the sense of being in pursuit of): (after) (después, después de, tras "de persecución").
Iba tras las riquezas.  He was after riches.
El perro salió tras ella.  The dog went after her.
Salió tras ella, pero no pudo alcanzarla. He went after her, but could not reach it.
Vamos tras la fama.  We're after fame.
Están tras la recompensa. They are after the reward.
El policía anda tras el ladrón. The police oficial is after the thief.
Behind (in location): 
Hay una caja fuerte tras el cuadro. There is a safe behind the picture.
Se escondió tras la puerta.  He hids behind the door.
Tras las puertas cerradas puede haber violencia.  Behind closed doors there can be violence.
Nos esconderemos tras esos árboles. We hid ourselves behind that trees.
Tras- also is commonly used as a prefix, and often the equivalent of the English prefix "trans-"
trascendental  transcendent
trascribir  to transcribe
trascontinental  transcontinental

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