This is the 5034th most frequent Russian word.
машиниста
"Machinist" or "train operator."
The word 'машинист' is used here to denote a train driver, which is its common usage.
Машинист управляет поездом.
The engineer operates the train.
In this sentence, 'машинист' could refer to a machinist, emphasizing a professional context where machinery is involved.
Ремонт машиниста был завершён вчера.
The machinist's repair was finished yesterday.
Here, 'машинист' is understood more broadly as an operator of machinery, possibly in various industry contexts.