station attendant; station staff
Refers to a railway station employee who assists passengers, handles tickets, or performs other station duties. Often used interchangeably with 駅員, but 駅係員 can emphasize a specific role or assignment.
See also: 駅員
I asked a station attendant how to buy a ticket.
ホームで駅係員が案内放送をしている。
A station staff member is making an announcement on the platform.