Peron był jeszcze bardziej zatłoczony tuż przed odjazdem pociągu.

Peron means platform, especially a train platform.

It is not a common English word, so many learners first notice it as new vocabulary. In this sentence, peron is the subject: the platform.

Grammar-wise, peron is:

• masculine
• singular
• nominative here, because it is the thing being described

Był is the past tense of być (to be).

So:

• jest = is
• był = was for a masculine singular subject

Because peron is masculine singular, Polish uses był.

Compare:

• Peron jest zatłoczony = The platform is crowded.
• Peron był zatłoczony = The platform was crowded.

Zatłoczony means crowded.

It agrees with peron, so it appears in the masculine singular form:

• peron → masculine singular
• zatłoczony → masculine singular

This is a very common Polish pattern: adjectives match the noun in gender, number, and usually case.

You might also see:

• zatłoczona stacja = a crowded station
• zatłoczone miejsce = a crowded place

Here jeszcze bardziej means even more.

So:

• bardziej zatłoczony = more crowded
• jeszcze bardziej zatłoczony = even more crowded

This is a very common way to strengthen a comparison.

Examples:

• bardziej interesujący = more interesting
• jeszcze bardziej interesujący = even more interesting

In this sentence, it suggests the platform was already crowded, and then it became even more crowded.

No. Jeszcze has several meanings depending on context.

Common meanings include:

• still: Jeszcze czekam = I am still waiting.
• yet: Jeszcze nie = not yet.
• even / even more: jeszcze bardziej = even more

In this sentence, it is the third meaning: even.

So jeszcze bardziej zatłoczony is not still more crowded in the English sense; it is better understood as even more crowded.

Tuż przed means just before or right before.

• przed = before
• tuż adds the idea of very close in time or immediately

So:

• przed odjazdem pociągu = before the train’s departure
• tuż przed odjazdem pociągu = just before the train’s departure

It makes the timing more precise.

Because the preposition przed requires the instrumental case, and the instrumental singular of odjazd is odjazdem.

So:

• dictionary form: odjazd = departure
• after przed: przed odjazdem = before the departure

This is a case pattern you simply need to learn with the preposition:

• przed domem = in front of the house
• przed obiadem = before lunch
• przed odjazdem = before departure

Because odjazd usually takes a noun in the genitive when you want to say whose departure it is.

So:

• odjazd pociągu = the departure of the train
• odjazd autobusu = the departure of the bus

Here:

• pociąg = train
• pociągu = of the train

So the full phrase przed odjazdem pociągu literally means before the departure of the train.

Yes:

• Peron — nominative singular
  It is the subject: the platform

• był — past tense of to be

• jeszcze bardziej zatłoczony — adjective phrase describing peron
  It matches peron in masculine singular

• tuż przed odjazdem pociągu — prepositional phrase meaning just before the train’s departure

  • odjazdem — instrumental singular, because of przed
  • pociągu — genitive singular, because it depends on odjazd

So the sentence is a nice example of how one phrase can contain more than one case relation.

The sentence is natural as written, but Polish word order is fairly flexible.

Original:

• Peron był jeszcze bardziej zatłoczony tuż przed odjazdem pociągu.

You could also say:

• Tuż przed odjazdem pociągu peron był jeszcze bardziej zatłoczony.

Both are correct. The difference is mostly about focus and style:

• starting with Peron focuses first on the platform
• starting with Tuż przed odjazdem pociągu emphasizes the time

Polish often moves elements around more freely than English.

Yes, it could.

• bardziej zatłoczony = more crowded
• jeszcze bardziej zatłoczony = even more crowded

Without jeszcze, the comparison is still there, but it is slightly less emphatic.
With jeszcze, the sentence sounds stronger and suggests a noticeable increase.

Polish can express the idea in more than one way.

This sentence uses a noun phrase:

• odjazd pociągu = the departure of the train

A version with a verb could be something like:

• tuż przed tym, jak pociąg odjechał = just before the train left

The version in your sentence is compact and very natural in written and neutral Polish. It sounds a bit more formal or structured than a clause with a verb, but it is completely ordinary.

A very literal translation would be:

The platform was still/even more crowded just before the departure of the train.

But the most natural English translation is:

The platform was even more crowded just before the train departed
or
The platform was even more crowded just before the train’s departure.

The Polish structure is slightly more noun-based than everyday English, but the meaning is the same.