Learn Hardcore Esperanto: Ne necesas rapidi al la stacidomo, ĉar la trajno malfruos. - It is not necessary to hurry to the station, because the train will be late.

Breakdown of Ne necesas rapidi al la stacidomo, ĉar la trajno malfruos.

Why does the sentence start with Ne necesas? Is there an implied it?

Yes. Ne necesas means it is not necessary or there is no need.

In Esperanto, necesi is often used impersonally, so you usually do not add a subject like English it. Esperanto simply says:

You may also see:

That means almost the same thing, just with necese as an adjective/adverb-like predicate instead of the verb necesi.

Why is rapidi in the infinitive form?

Because it follows the idea of necessity: it is not necessary to hurry.

After necesas, Esperanto commonly uses an infinitive to say what action is or is not necessary:

So:

The person who would be doing the hurrying is understood from context. Esperanto does not need to spell it out here.

Could this also be said as Ni ne bezonas rapidi?