L'últim tren arriba amb retard.

Because Catalan usually uses the definite article where English often uses the. Here, l' is the shortened form of el before a vowel:

• el últim tren → l'últim tren

So L'últim tren means the last train.

L' is the contracted form of the singular definite article:

• el before a masculine noun
• la before a feminine noun

When the next word begins with a vowel or silent h, the article is often shortened:

• el últim → l'últim
• la hora → l'hora

In this sentence, it comes from el, because tren is masculine.

In Catalan, adjectives can come before or after the noun, depending on the adjective and the meaning. Últim commonly comes before the noun when it means last in an ordered series:

• l'últim tren = the last train

This is normal and natural word order in Catalan.

Tren is masculine, so it uses masculine forms:

• el tren
• l'últim tren

If it were feminine, the article and adjective would be different.

Arriba is the 3rd person singular present form of the verb arribar (to arrive):

• jo arribo = I arrive
• tu arribes = you arrive
• ell/ella arriba = he/she/it arrives

Since the subject is l'últim tren (the last train), Catalan uses arriba.

Because Catalan verbs already change form to show the subject. English often needs helper words in some contexts, but Catalan usually does not.

So:

• The last train arrives late
• L'últim tren arriba amb retard

The verb form arriba already tells you it is he/she/it or a singular noun.

Amb retard is a very common expression meaning late or delayed, especially for transport such as trains, buses, or flights.

Literally, it means with delay:

• amb = with
• retard = delay

So arriba amb retard means arrives late / arrives with a delay.

No. In Catalan, retard normally means delay, and it is a neutral everyday word.

For example:

• El vol surt amb retard. = The flight leaves late.
• Hi ha un retard de deu minuts. = There is a ten-minute delay.

So learners should not interpret it the way the English word may be used.

Yes, arriba tard is possible and means arrives late. But amb retard is especially common in formal, travel, and timetable contexts.

Compare:

• arriba tard = arrives late
• arriba amb retard = arrives with a delay / is delayed

For trains, announcements, and transport information, amb retard sounds very natural.

Catalan often leaves out subject pronouns because the verb ending usually makes the subject clear.

So instead of saying something like it arrives, Catalan just says:

• arriba

The noun l'últim tren is already the subject, so no extra pronoun is needed.

The word order is:

• L'últim tren = subject
• arriba = verb
• amb retard = prepositional phrase / adverbial expression

So the structure is basically:

Subject + Verb + Expression

This is a very common and natural Catalan sentence pattern.

A simple approximate pronunciation is:

LOOL-teeM tren ah-REE-bah ahm reh-TART

A few useful notes:

• últim has stress on the first syllable: ÚL-tim
• arriba has stress on ri: a-RRI-ba
• retard has stress on the last syllable: re-TARD

The exact pronunciation can vary a little by dialect, but this will help you say it understandably.

Yes, completely natural. It sounds like the kind of sentence you might see or hear in a station announcement, a travel app, or a conversation about transport.

It is a standard, idiomatic way to say that the last train is late.