Na tym przystanku wsiadamy do autobusu do centrum.

In Polish, przystanek (bus stop / tram stop / stop) is normally used with na:

• na przystanku = at the stop

This is just the standard preposition for this idea. English uses at, but Polish uses na.

So:

• na tym przystanku = at this stop

Using w tym przystanku would sound wrong here, because w usually means in / inside, and a stop is not treated as something you are physically inside.

Because the preposition na here requires the locative case when it means at / on in a fixed location.

The noun przystanek is masculine, and in the locative singular:

• ten → tym
• przystanek → przystanku

So:

• ten przystanek = this stop
• na tym przystanku = at this stop

Both the adjective/demonstrative and the noun have to match the required case.

For the same reason: after na in this meaning, Polish uses the locative.

Base form:

• przystanek = stop

Locative singular:

• na przystanku = at the stop

So in the sentence:

• na tym przystanku = at this stop

This is a very common pattern in Polish:

• w domu = in the house
• na stole = on the table
• na przystanku = at the stop

Wsiadamy comes from wsiadać, which means to get in / to board a vehicle.

Here:

• wsiadamy = we get on / we board

It is 1st person plural present tense:

• wsiadam = I get on
• wsiadasz = you get on
• wsiadamy = we get on

In many contexts, the Polish present tense can also refer to a near-future planned action, so wsiadamy can feel like:

• we get on
• we’re getting on
• we board
• sometimes even we’re boarding

depending on context.

Polish often uses the imperfective present to talk about a normal, current, or planned action.

• wsiadać = imperfective, to be getting on / to get on
• wsiąść = perfective, to get on / board as a completed action

So:

• wsiadamy do autobusu can mean we get on the bus / we’re getting on the bus
• wsiądziemy do autobusu would mean we will get on the bus

In this sentence, wsiadamy sounds natural because it describes what happens at that stop, almost like a general or immediate action.

The verb wsiadać / wsiąść normally takes do + genitive when talking about boarding something you go into.

So:

• wsiadać do autobusu = to get on a bus
• wsiadać do samochodu = to get into a car
• wsiadać do pociągu = to get on a train

Even though English says get on a bus, Polish uses do, literally closer to into.

That is why:

• autobus becomes autobusu after do

Because the two do phrases do different jobs:

• do autobusu = connected to wsiadamy
  → we board the bus
• do centrum = connected to autobusu
  → a bus to the city centre

So the sentence structure is basically:

• At this stop, we board [a bus [to the centre]].

It may look repetitive in English, but in Polish this is completely normal and natural.

Both are after do, and do requires the genitive.

So:

• autobus → autobusu
• centrum → centrum

The interesting part is that centrum is a neuter noun whose genitive singular has the same form as the nominative:

• nominative: centrum
• genitive: centrum

So even though the form does not change, it is still genitive because of do.

Usually it means to the city centre / into the city centre, indicating destination.

So:

• autobus do centrum = a bus to the centre

It tells you where the bus is going.

In everyday use, this is the normal way to say that a bus goes to the city centre.

Yes. Polish has no articles, so autobusu does not tell you by itself whether English should use a or the.

Depending on context, it could be:

• we get on a bus to the centre
• we get on the bus to the centre

If the meaning is already known in context, either may be right in English.

Because wsiadać does not work that way in standard Polish.

You say:

• wsiadać do autobusu = to board / get on the bus

not:

• wsiadać na autobus

However, na autobus can appear with other verbs, for example:

• czekamy na autobus = we are waiting for the bus

So na autobus is possible in Polish, just not with wsiadać.

Sometimes, but it is not the most natural choice here.

• wchodzić do autobusu literally means to go into the bus
• wsiadać do autobusu means to board / get on the bus

When talking about using transport, wsiadać is the standard verb.
Wchodzić focuses more on the physical motion of entering, not the transport action itself.

So in this sentence, wsiadamy do autobusu is definitely the better option.

The sentence has a very natural Polish word order:

• Na tym przystanku = setting/place
• wsiadamy = verb
• do autobusu do centrum = object/complement

So literally:

• At this stop, we get on a bus to the centre.

Polish word order is flexible, so other orders are possible, for example:

• Wsiadamy na tym przystanku do autobusu do centrum.
• Do autobusu do centrum wsiadamy na tym przystanku.

But the original version sounds neutral and natural. Different word orders would mainly change emphasis.

It means at this stop.

Even though Polish uses na, you should not translate it mechanically as on. Prepositions often do not match directly across languages.

So:

• na tym przystanku = at this stop

This is one of those places where you simply learn the Polish combination as a set phrase.

A rough English-friendly guide is:

• Na tym przystanku wsiadamy do autobusu do centrum
  → nah tihm psheh-STAHN-koo fshah-DAH-mih doh ow-tow-BOO-soo doh TSEN-troom

A few useful pronunciation notes:

• prz often sounds roughly like psh / pzh
• wsi- in wsiadamy starts with a sound close to fsh
• c in centrum sounds like ts
• stress in Polish is usually on the second-to-last syllable:
  • przystanku
  • wsiadamy
  • autobusu
  • centrum

This is only an approximation, but it can help you get started.