Vårt tåg kommer in på ett annat spår, så vi måste gå snabbt.

Because tåg is an ett-word in Swedish: ett tåg.

The possessive our changes form depending on the gender and number of the noun:

• vår for common gender singular (en-word)
• vårt for neuter singular (ett-word)
• våra for plural

So:

• vår bil = our car
• vårt tåg = our train
• våra väskor = our bags

That is why vårt tåg is correct.

For the same reason: spår is also an ett-word.

The word annan (another / other) agrees with the noun:

• en annan
  • en-word
• ett annat
  • ett-word
• andra
  • plural or definite contexts

So:

• en annan bok = another book
• ett annat spår = another track/platform
• andra tåg = other trains

That is why the sentence uses ett annat spår.

Literally, spår means track.

In train-station Swedish, though, spår is very often what you look for in announcements and on signs, and in practice it often works a bit like English platform number in everyday travel situations.

So:

• Tåget kommer in på spår 4 = The train arrives on track/platform 4

A learner should remember that Swedish railway language often uses spår where English might naturally say platform.

Here kommer in på means something like comes in on / arrives on.

It is built from:

• kommer = comes
• in = in
• på = on

So Vårt tåg kommer in på ett annat spår means the train is arriving on a different track/platform than expected.

This is a natural Swedish way to say it. In more formal language, you might also see verbs like ankomma, but kommer in på sounds very normal and everyday.

Because måste is a modal verb, and modal verbs in Swedish are followed directly by the infinitive.

So:

• vi måste gå = we must go
• jag kan simma = I can swim
• du vill äta = you want to eat

Not:

• vi måste att gå ❌

This is similar to English, where we say must go, not must to go.

It can mean either, depending on context.

The basic meaning of gå is often go or walk. In this sentence, since they are at a station and need to reach another track/platform, gå snabbt most naturally means:

• walk quickly
• move quickly

So English might translate it as we have to hurry or we need to walk fast.

Because snabbt is the adverb form, meaning quickly.

• snabb = quick / fast (adjective)
• snabbt = quickly / fast (adverb)

Examples:

• ett snabbt tåg = a fast train
• hon springer snabbt = she runs quickly

In vi måste gå snabbt, the word describes how we must go, so Swedish uses the adverb snabbt.

Both are possible in Swedish, but they are not used in exactly the same way.

In your sentence, så means so, as a coordinating conjunction:

• Vårt tåg kommer in på ett annat spår, så vi måste gå snabbt.
• Our train is coming in on another track, so we have to walk quickly.

After this kind of så, Swedish usually keeps normal main-clause word order:

• vi måste ...

If you said så måste vi gå snabbt, that can also be correct, but it often sounds a bit more like therefore we must walk quickly or gives extra emphasis.

So for a straightforward statement, så vi måste gå snabbt is very natural.

Swedish often uses the simple present where English uses either simple present or present progressive.

So:

• tåget kommer in = the train comes in / is coming in

In context, it clearly refers to something happening now or very soon, so English usually translates it as is coming in or is arriving.

This is very normal in Swedish:

• Jag äter nu = I am eating now
• Bussen går om fem minuter = The bus leaves in five minutes

Sometimes learners may want to drop in, but kommer in på is the more natural expression here when talking about a train arriving into a station.

• kommer in på spår 7 = comes in on track 7 / arrives on track 7

Without in, the sentence may sound less idiomatic in this context. Swedish often uses these small particles in ways that do not translate word-for-word into English, so it is best to learn kommer in på as a useful travel phrase.

It is close, but not exactly the same word.

• annan / annat / andra = another, other
• olika / annorlunda / ett annat can sometimes express different, depending on context

In this sentence, ett annat spår means another track or a different track. English often uses different naturally here, even though the Swedish word is literally another / other.

So:

• ett annat spår = another track / a different track

Yes, very much so. The exact wording could vary, but all the pieces are very natural Swedish for travel situations.

You might hear similar phrases such as:

• Tåget kommer in på spår 5.
• Tåget kommer in på ett annat spår än planerat.
• Vi måste gå snabbt till spår 8.

So this sentence is useful real-world Swedish, especially for understanding station announcements or talking while traveling.