kyouto made ha tokkyuu de ikeba hayai desu ga, syuuten made norisugosanai you ni ki wo tukemasu.

まで means up to / as far as. So 京都まで means as far as Kyoto.

When は is added, it makes that whole phrase the topic and often adds a contrastive nuance:

• 京都までは = as for up to Kyoto...
• It can imply something like up to Kyoto is one case, but beyond that may be different

So here, 京都までは特急で行けば早いです means something like As far as Kyoto, going by limited express is fast.

特急 means limited express.

It is a type of train that stops at fewer stations than a local train, so it is faster. In Japanese train vocabulary:

• 普通 = local train
• 急行 = express
• 特急 = limited express

So 特急で means by limited express or on a limited express train.

Here, で marks the means or method used to do something.

So:

• 特急で行く = go by limited express
• バスで行く = go by bus
• 車で行く = go by car

In this sentence, で tells you what mode of transportation is being used.

行けば is the -eba conditional form of 行く.

• 行く = to go
• 行けば = if [someone] goes

So:

• 特急で行けば早いです = If you go by limited express, it’s fast

This -eba form is often used for:

• conditions
• advice
• general cause-and-effect statements

It sounds natural in sentences like this where one choice leads to a certain result.

早い is an i-adjective, and here it is being used as the main predicate:

• 早いです = is fast

By contrast, 早く is the adverb form:

• 早く行く = go early / go quickly

So in this sentence, the structure is:

• 特急で行けば = if you go by limited express
• 早いです = it is fast

You could make a different sentence with 早く, but here 早いです is the correct form for it’s fast.

Yes, が here means but, but it often sounds a little softer than a strong English but.

It links two ideas:

• Going to Kyoto by limited express is fast
• I’ll be careful not to ride past my stop all the way to the final station

So が shows contrast or a shift to a related concern.

In many Japanese sentences, が can sound closer to:

• but
• though
• however

depending on context.

終点 means the last stop / terminal station / terminus.

So:

• 終点まで = all the way to the final stop

This uses まで again to mark the endpoint.

In the sentence, it means the speaker is being careful not to stay on the train too long and end up riding all the way to the last station.

It breaks down like this:

• 乗り過ごす = to ride past, to miss your stop by staying on too long
• 乗り過ごさない = not ride past / not miss your stop
• ように = so that / in order to / so as to

So:

• 乗り過ごさないように = so as not to ride past [my stop]
• or more naturally, so I don’t miss my stop

This pattern is very common:

• 忘れないようにメモします = I make a note so I won’t forget
• 遅れないように早く出ます = I leave early so I won’t be late

Because Japanese often leaves out information that is obvious from context.

乗り過ごす already implies riding past the place where you were supposed to get off. So the sentence does not need to explicitly say:

• 駅を
• 自分の降りる駅を

Even though English often says miss my stop, Japanese can just say 乗り過ごす and let the listener infer it.

気をつける is a set expression meaning:

• to be careful
• to pay attention
• to watch out

Literally, it contains 気 meaning something like mind / attention / awareness, but it is best learned as one fixed phrase.

So:

• 乗り過ごさないように気をつけます = I’ll be careful not to miss my stop

The ます form makes it polite.

In Japanese, the non-past form often covers both:

• present
• future

So 気をつけます can mean:

• I am careful
• I will be careful

Here it is understood as future or intention from context:

• I’ll be careful not to ride past my stop

This is very normal in Japanese. You do not need a separate future tense form.

The subject is omitted, which is very common in Japanese.

From the context, 気をつけます strongly suggests the speaker is talking about themself, so the implied subject is most naturally:

• I

In 特急で行けば早いです, the subject is also not stated explicitly. It can be understood generally as:

• if you go by limited express, it’s fast
• or if one goes by limited express, it’s fast

Japanese often leaves subjects unstated when they are easy to infer.