Den här bussen är pålitlig även när det är mycket trängsel på morgonen.

Because buss is a common gender noun in Swedish: en buss.

In Swedish, this agrees with the gender of the noun:

• den här
  • en-word
• det här
  • ett-word

So:

• den här bussen = this bus
• det här huset = this house

You could also say denna buss, which is a bit more formal or written-sounding.

Because pålitlig is describing bussen, and bussen is an en-word.

After är, adjectives still agree with the noun they describe:

• Bussen är pålitlig = The bus is reliable
• Huset är pålitligt = The house is reliable

So:

• en buss → pålitlig
• ett tåg → pålitligt

Literally, den här is like that here, but in normal English it simply means this.

So:

• den här bussen = this bus

Swedish often forms this/these with:

• den här for common gender singular
• det här for neuter singular
• de här for plural

Examples:

• den här stolen = this chair
• det här bordet = this table
• de här böckerna = these books

När means when.

Även när means even when.

So the sentence is stronger than just saying the bus is reliable when it is crowded. It says the bus is reliable even when conditions are difficult.

Compare:

• när det är mycket trängsel = when there is a lot of crowding
• även när det är mycket trängsel = even when there is a lot of crowding

This is a very common Swedish pattern. Det är is often used like English there is/it is in general statements about situations or conditions.

Here, det does not refer to a specific thing. It is a dummy subject.

So:

• det är mycket trängsel = there is a lot of crowding / it is very crowded

Similar examples:

• det är kallt = it is cold
• det är mycket folk här = there are a lot of people here
• det är problem med tågen = there are problems with the trains

Because trängsel is not a countable plural noun here. It is more like crowding, congestion, or a lot of pressure from many people.

In Swedish:

• mycket is used with uncountable nouns or general amounts
• många is used with countable plural nouns

So:

• mycket trängsel = a lot of crowding
• många människor = many people

You cannot normally count trängsel as separate items in this sentence, so mycket is the natural choice.

Trängsel means crowding, congestion, or a crush of people.

It is often used for situations where there are too many people in too little space, especially in public transport, stations, shops, or streets.

So in this sentence, it suggests that the bus remains reliable even during crowded morning conditions.

Related words:

• trång = cramped, narrow
• trängas = to squeeze in / push together / crowd

Because Swedish usually says på morgonen for in the morning.

This is just the normal idiomatic expression:

• på morgonen = in the morning
• på kvällen = in the evening
• på natten = at night

So although English uses in, Swedish often uses på in these time expressions.

Be careful not to confuse:

• på morgonen = in the morning
• i morgon = tomorrow

Those are completely different.

In Swedish, time expressions like på morgonen, på kvällen, and på eftermiddagen are often used in the definite form.

So:

• på morgonen = in the morning
• på kvällen = in the evening

This is just the standard Swedish way to express these parts of the day in many contexts.

In this sentence, på morgonen means in the morning / during the morning rush period, not necessarily one single specific morning.

Grammatically, it says the bus is reliable: bussen är pålitlig.

But in real usage, Swedish—like English—often uses the bus to mean the bus route, service, or system connected with that bus. So the meaning is probably that this bus service is dependable, even during crowded morning conditions.

This is a normal kind of shorthand in everyday language.

Yes. Denna buss also means this bus.

But there is a style difference:

• den här bussen = more natural in everyday speech
• denna buss = more formal, written, or official-sounding

So in conversation, den här bussen is usually the more natural choice.

The structure is:

• Den här bussen = subject
• är pålitlig = verb + adjective
• även när det är mycket trängsel på morgonen = extra clause explaining under what conditions

So the pattern is:

[Subject] + [verb] + [description] + [subordinate clause]

More literally:

• Den här bussen = This bus
• är pålitlig = is reliable
• även när = even when
• det är mycket trängsel = there is a lot of crowding
• på morgonen = in the morning

This is a very typical Swedish sentence structure.