dono densya ni norimasu ka.

どの must directly modify a noun, so it comes before 電車.

• どの電車 = which train
• どれ = which one

So:

• どの電車に乗りますか。 = Which train will you take / ride?
• どれに乗りますか。 = Which one will you take / ride?

You use どの when you say the noun itself, and どれ when the noun is left unstated.

In this sentence, に marks the thing you get on or ride.

The verb 乗ります comes from 乗る, which often uses に for the vehicle, train, bus, bicycle, and so on.

Examples:

• 電車に乗ります = ride/get on the train
• バスに乗ります = ride/get on the bus
• 自転車に乗ります = ride a bicycle

So 電車に乗ります is the normal pattern.

乗ります is the polite non-past form of 乗る.

That form is commonly used for:

• present habits
• near-future actions
• polite statements and questions

So in a question like this, 乗りますか is a natural polite way to ask.

Related forms:

• dictionary form: 乗る
• polite form: 乗ります
• past polite: 乗りました
• negative polite: 乗りません

A casual version would be:

• どの電車に乗る？

か marks the sentence as a question in polite Japanese.

So:

• 乗ります。 = a statement
• 乗りますか。 = a question

In everyday casual speech, people often leave out か and use rising intonation instead, but in polite speech か is very common and standard.

Japanese often leaves out the subject when it is understood from context.

In English, you usually need to say Which train are you taking?
In Japanese, if the listener is clearly the one being asked, you do not need to say あなたは.

So:

• どの電車に乗りますか。 is completely natural.
• あなたはどの電車に乗りますか。 is grammatically possible, but often unnecessary and can sound overly explicit depending on context.

Yes, Japanese word order is different from English.

This sentence follows a very normal Japanese pattern:

• どの電車 = which train
• に = marks the train as the thing boarded
• 乗ります = ride/get on
• か = question marker

Japanese verbs usually come near the end of the sentence.
So instead of English Which train do you ride?, Japanese is more like Which train on ride?

Because particles show the grammatical role of words, Japanese word order can be somewhat flexible, but this version is the most standard and natural.

It is read:

どのでんしゃにのりますか

In romanization:

dono densha ni norimasu ka

A rough pronunciation guide:

• どの = do-no
• 電車 = den-sha
• に = ni
• 乗ります = no-ri-ma-su
• か = ka

Also, in natural speech, ます may sound lighter than in careful textbook pronunciation.

No. Japanese is normally written without spaces.

So this learner-friendly version:

どの　電車　に　乗ります　か。

would normally be written as:

どの電車に乗りますか。

Spaces are often added in beginner materials to make the parts easier to see.

Yes. Depending on context, 乗ります can be translated as:

• ride
• get on
• take (for transportation)

So this sentence could be understood naturally in English as:

• Which train will you ride?
• Which train are you getting on?
• Which train will you take?

Japanese often does not separate these as strictly as English does in beginner-level sentences.

電車 specifically means an electric train and is commonly used for ordinary trains, especially local or commuter trains.

It does not mean transportation in general.

For other vehicles, Japanese uses different words:

• 電車 = train
• バス = bus
• 車 = car
• 地下鉄 = subway
• 新幹線 = bullet train

So どの電車に乗りますか。 is specifically asking about a train, not just any vehicle.