Quan arribis a l'andana, mira si el tren té retard i truca'm.

Because after quan when you are talking about a future action, Catalan normally uses the present subjunctive.

• Quan arribes... = when you arrive / when you are arriving (more like a habitual or general situation, depending on context)
• Quan arribis... = when you arrive in the future

So in this sentence, Quan arribis a l'andana means When you get to the platform.

This is something English speakers often notice because English does not use a special subjunctive form here.

Arribis is the 2nd person singular present subjunctive of arribar (to arrive).

The present subjunctive of arribar is:

• jo arribi
• tu arribis
• ell/ella arribi
• nosaltres arribem
• vosaltres arribeu
• ells/elles arribin

Here it matches an understood tu, because the rest of the sentence is also speaking to one person informally: mira and truca'm.

This is because a + la/ l' combines with the article before a feminine noun starting with a vowel.

• andana = platform
• the definite article is l' because the word starts with a vowel sound
• so a l'andana = to the platform / at the platform

Compare:

• a la casa
• a l'estació
• a l'andana

So l' here is just the normal article form before a vowel.

Andana means a platform, especially a train platform.

So:

• l'andana = the platform
• arribar a l'andana = to arrive at the platform

A learner might also see via in station contexts, but andana is specifically the platform area.

Yes. Mira is the informal singular imperative of mirar (to look, to check).

Here it means something like:

• check
• look and see

So mira si el tren té retard means check whether the train is delayed.

Because the sentence is addressing one person informally (tu), it uses:

• mira = informal singular command

Other possibilities would be:

• miri = formal singular
• mireu = informal plural
• mirin = formal plural

In Catalan, si can introduce an indirect yes/no question, just like English if or whether.

So:

• mira si el tren té retard = check if / whether the train is delayed

In natural English, whether is often a slightly clearer translation, but if is also perfectly fine.

So here si does not mean yes. It is the conjunction if / whether.

Because tenir retard is a common Catalan way to say that a train, bus, etc. is delayed.

Literally:

• té = has
• retard = delay

So el tren té retard literally means the train has delay, but naturally it means:

• the train is delayed
• the train is running late

This is just an idiomatic difference between Catalan and English.

Té is the 3rd person singular present of tenir (to have).

• jo tinc
• tu tens
• ell/ella té
• nosaltres tenim
• vosaltres teniu
• ells/elles tenen

So:

• el tren té retard = the train has delay / is delayed

The accent in té is important, because it distinguishes it from te (tea).

Because Catalan often drops subject pronouns when the verb already makes the subject clear.

In this sentence:

• arribis already tells you the subject is tu
• mira also shows it is a command to tu
• té shows the subject is el tren

So Catalan does not need to say:

• Quan tu arribis...
• mira si ell té retard...

It could include pronouns for emphasis, but normally it leaves them out.

Truca'm means call me.

It is made from:

• truca = call! (informal singular imperative of trucar)
• 'm = short form of em (me)

So:

• truca'm = call me

In Catalan, object pronouns are often attached to affirmative imperatives:

• truca'm = call me
• digue'm = tell me
• porta'l = bring it

This is different from English, where the pronoun stays separate.

Because in affirmative commands, the weak pronoun is attached to the end of the verb, and em is reduced to 'm after a vowel.

So:

• truca + em becomes truca'm

This apostrophe shows the shortened form.

Compare:

• dóna'm = give me
• explica'm = explain to me
• truca'm = call me

No. With a negative command, the pronoun normally goes before the verb.

So:

• affirmative: truca'm = call me
• negative: no em truquis = don't call me

This is a very common pattern in Catalan:

• fes-ho = do it
• no ho facis = don't do it

So learners should remember:

• affirmative imperative → pronoun usually attached after the verb
• negative imperative → pronoun usually before the verb

Because that first part is an introductory subordinate clause:

• Quan arribis a l'andana, = When you get to the platform,

Then the main commands follow:

• mira si el tren té retard i truca'm

The comma helps separate the time clause from the main clause. This is very natural punctuation in Catalan.

Both are possible, but in this sentence check is the most natural English translation.

• mira literally comes from mirar = to look
• but in many contexts it means look and see, check, or see whether

So:

• mira si el tren té retard = check whether the train is delayed

If you translated it as look if the train is delayed, an English speaker would understand it, but check sounds more natural.

Yes, retard is the normal Catalan noun for delay.

Examples:

• El vol té retard. = The flight is delayed.
• Hi ha un retard de deu minuts. = There is a ten-minute delay.

Depending on context, Catalan can also use other expressions, but tenir retard is very common for transport.

Yes. The whole sentence is built around tu forms:

• arribis = present subjunctive for tu
• mira = imperative for tu
• truca'm = imperative for tu

So the speaker is talking to one person in an informal way.

A formal version would look different, for example:

• Quan arribi a l'andana, miri si el tren té retard i truqui'm.

Yes, depending on context.

• Quan arribis a l'andana... can mean When you get to the platform...
• It could also be translated as Once you get to the platform...

Both work because the idea is: first you arrive there, then you check the train and call.

So the exact English wording can vary, even though the Catalan grammar stays the same.