Di rel sebelah, petugas memeriksa gerbong barang sebelum kereta berangkat lagi.

When sebelah comes after a noun, it can mean the one next to it or the adjacent one. So rel sebelah means the neighboring track.

But di sebelah rel is a different structure:

• di sebelah = beside / next to
• rel = the track

So di sebelah rel means beside the track, not on the neighboring track.

That opening phrase gives the setting of the sentence. Indonesian often puts a location phrase first for emphasis or scene-setting, and the comma helps separate that opening information from the main clause.

It is similar to English sentences like On the next track, the staff inspect the freight car. In less careful writing, the comma might be omitted, but it is very natural here.

petugas is a general word for an officer, an attendant, a staff member, or personnel on duty.

By itself, it does not clearly mark singular or plural. So depending on context, it can mean:

• the officer / a staff member
• the staff / staff members

If you want to make it clearly plural, Indonesian often uses para petugas or sometimes petugas-petugas.

The base word is periksa, meaning check, inspect, or examine. memeriksa is the normal active verb form used when someone performs that action on something.

So:

• periksa = base form / dictionary form, or sometimes an imperative
• memeriksa = to inspect / is inspecting

The meN- prefix is very common in Indonesian for active verbs. With periksa, it becomes memeriksa.

gerbong means railcar, wagon, or carriage, and barang means goods or cargo. So gerbong barang means freight car or cargo wagon.

The order may feel backwards to an English speaker, but in Indonesian the main noun usually comes first and the describing noun comes after it:

• gerbong barang = literally wagon cargo
• natural English = cargo wagon or freight car

Indonesian does not use articles like a, an, or the. Whether something is definite or indefinite is understood from context.

So:

• petugas can mean a staff member or the staff member
• kereta can mean a train or the train
• gerbong barang can mean a freight car or the freight car

English forces you to choose; Indonesian often does not.

sebelum means before. It can be followed by a noun phrase or by a full clause.

Here it introduces a clause:

• sebelum kereta berangkat lagi
• before the train departs again

So it connects the two actions:

1. the staff inspect the freight car
2. the train departs again

Yes. In this context, kereta clearly means train. In fuller form, Indonesian often says kereta api, but in a railway context kereta alone is very common.

Because the sentence already mentions rel and gerbong, the meaning train is obvious.

berangkat means to depart, to leave, or to set off. lagi here means again.

So:

• berangkat lagi = depart again / leave again

In Indonesian, lagi commonly comes after the verb or phrase it modifies, so this word order is normal.

The subject is kereta. So it is the train that departs again.

That means the sentence is not saying that petugas or gerbong barang departs. The second clause has its own subject:

• kereta berangkat lagi = the train departs again

Indonesian verbs do not change form for past, present, or future the way English verbs do. Time is usually understood from context or from extra words such as:

• kemarin = yesterday
• sedang = in progress
• akan = will / going to

So memeriksa and berangkat do not themselves tell you the tense. Without extra context, this sentence can sound like a present-time description or part of a narrative.