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> 「タッタッタ」って車に乗ってみたい **な** 。

I'd translate the sentence like this:

> I want to enter/ride in a car that makes 'tatata'.

I don't think it's the colloquial version of ような, so I think it is みたい plus な.
But in this case, I don't know what it supposes to mean.

What is this な at the end?
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grammar particle-な
What does this な at the end of the sentence mean?
Here な is one of those emotive particles that can get tagged to the end of a
sentence. I'm not entirely sure what the 「タッタッタ」 part is about, but otherwise
the sentence is saying, kind of dreamily and hopefully, "I'd like to try a
ride in the car". If you were to try to translate な directly, then you could
add something like, "wouldn't it be nice if..." but I feel that's really
stretching it a bit and such a translation won't necessarily work universally.
(I guess I already tried to get part of that feel in my translation when I
wrote "I'd like to try" instead of more directly "I want to try".)
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This `な` is different from `な` used in orders (e.g. `行きな` or `行くな`) and is
usually considered to be a stronger/masculine version of `ね` (but with a more
wishful nuance). Sometimes it also occurs in the emphasized version `なあ`,
similar to `ねえ`.

Probably the most used expression with it is `いいな(あ)`, expressing envy over
something which happened to someone else but you'd like to experience
yourself.

See also answers to [Identifying different ending -な
s](https://japanese.stackexchange.com/questions/48279/)
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As A.Ellett said this `な` shows the speaker's desire. It's the kind of thing
we would use emphasis words or vocal inflection to denote in English. You can
hear girly girls lengthen and often nasalize this, which can be represented as
`な～` or `なあ`. By the by, a "cool guy/girl" type (or even someone being snotty)
would use this inflection `みたいな{LHLL}`, whereas `みたいな{LHLHH}` is more
endearing and effeminate with or without the ending `あ`.

As for the `「タッタッタ」`, it immediately makes me think of the Flintstone's car
because `タッタッタッ` is the sound of jogging or trotting. It's more rhythmic than
a full sprint sound. More likely it's meant to imitate the sound of a vehicle
with a large muffler or something like that. Think the sounds we use in
English for a train chugging along.

Also, Igor Skochinsky's explanation for `いいなあ` is the best I've ever heard.
You can hear this a lot among school-aged kids.

Your translation is fine. If you want to represent the `な`, you could change
it to

> I really want to ride in a car that makes "ta-ta-ta."

or, more colloquially,

> I'd really like to ride in a "ta-ta-ta" car, you know?

Also, keep in mind that `みたい` adds the sense of "try" or "try out" to the
sentence, so maybe the most natural translation would be

> I'd really like to try riding in one of those "ta-ta-ta" cars, you know?
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