From Bulbapedia, the community-driven Pokémon encyclopedia.
The Ampharos Train crew consists of one conductor and one driver. Both of them were the characters of the day in Frozen on Their Tracks.
Both of them are in charge of a train powered only by an Ampharos that leads from Snowpoint City to Lake Acuity.
The driver usually tells Ampharos when to use Thunderbolt to power the train.