asa no densya ha zyoukyaku ga ookute, eki no hoomu mo kanari komimasu.

朝の電車 means morning train or trains in the morning. Here, 朝 is being used like a noun that modifies another noun, and の connects them.

So:

• 朝 = morning
• 電車 = train
• 朝の電車 = morning train(s)

If you said 朝に電車, that would sound incomplete, because に marks a time for an action, but here there is no verb directly after it. の is the natural choice when one noun describes another noun.

This is a very common Japanese pattern.

• 電車は sets the topic: as for the morning trains...
• 乗客が多い gives the specific statement: the passengers are many

So the structure is roughly:

• As for morning trains, passengers are many...

In more natural English, that becomes something like:

• Morning trains have a lot of passengers...

Japanese often uses は for the bigger topic and が for what is being described inside that topic.

多い usually describes the amount or number of something, and that “something” is very often marked by が.

So:

• 乗客が多い = there are many passengers / passengers are numerous

Using は is possible in some contexts, but it changes the nuance, often adding contrast or emphasis. In a neutral statement like this, が is the most natural choice.

So 乗客が多い is the standard way to say there are many passengers.

多くて is the て-form of 多い.

• 多い = many / numerous
• 多くて = being many, and... / because there are many...

The て-form connects this part to the next part of the sentence.

So:

• 乗客が多くて、駅のホームもかなり混みます。

can mean something like:

• There are many passengers, and the station platforms also get quite crowded.
• or, depending on nuance, Because there are many passengers, the station platforms also get quite crowded.

The て-form is often used to link related facts smoothly.

It can suggest either, depending on context.

In this sentence, 多くて mainly links two closely related facts:

1. there are many passengers
2. the platforms get crowded

English might translate that connection as:

• and
• so
• because

Japanese often leaves that exact relationship a little softer and more flexible than English does. Here, it feels like a natural connection with a hint of cause: there are many passengers, so the platforms get crowded too.

も means also or too.

So:

• 駅のホームもかなり混みます
• the station platforms also get quite crowded

The sentence first talks about one crowded-related fact: there are many passengers. Then も adds another related fact:

• not only are there many passengers,
• the platforms also get crowded.

It helps tie the two parts together.

駅のホーム means the station platform or the platforms at the station.

• 駅 = station
• ホーム = platform
• 駅のホーム = station platform

Again, の links one noun to another. It can show possession, location, type, or association. Here it means something like:

• the platform of the station
• more naturally in English: the station platform

Also, ホーム here is a Japanese word borrowed from English home, but in Japanese railway vocabulary it means platform.

Because ホーム is a loanword.

Many borrowed words in Japanese are written in katakana, and ホーム is one of them. In everyday Japanese, ホーム commonly means a train platform, even though the original English word is platform, not home.

So this is one of those cases where Japanese borrowed a form with a specialized meaning.

Both are possible, but they have slightly different feels.

• 混みます = gets crowded / is crowded (general, habitual, regular situation)
• 混んでいます = is crowded (state, what it is like right now or generally in a more descriptive way)

In this sentence, 混みます sounds like a general statement about what usually happens in the morning:

• In the morning, the platforms get quite crowded.

It has a habitual sense, like describing a regular pattern.

If you said 混んでいます, it might sound a bit more like describing the current condition or a more vivid ongoing state.

In Japanese, the non-past form often covers:

• future actions
• habitual actions
• general truths
• regular occurrences

Here, 混みます is being used for a habitual/general meaning:

• Morning trains are crowded
• The platforms get quite crowded

So it does not have to mean future time. It can mean this is what usually happens.

It can mean either, depending on context, but here it most naturally means trains in general during the morning commute.

Japanese nouns usually do not mark singular vs. plural clearly the way English does. So:

• 電車 can mean a train
• or trains

In this sentence, 朝の電車は is best understood as a general category:

• morning trains
• the trains in the morning

かなり means considerably, fairly, or quite.

So:

• かなり混みます = gets quite crowded

It is similar to とても, but the nuance is a little different:

• とても = very
• かなり = quite / fairly / to a considerable degree

かなり often sounds a bit more measured or objective than とても. In this sentence, it fits well because the speaker is describing how crowded the platforms become in a fairly matter-of-fact way.

A helpful way to break it down is:

• 朝の電車は = as for morning trains
• 乗客が多くて = there are many passengers, and/because
• 駅のホームも = the station platforms also
• かなり混みます = get quite crowded

So the sentence is built like this:

1. set the topic
2. describe one condition
3. add another related result/fact

This kind of topic-based structure is very common in Japanese.