TRAIN CONTROL DEVICE, TRAIN CONTROL SYSTEM, AND TRAIN CONTROL METHOD

A train control device includes: a control unit that calculates a control speed of the train at a current position with respect to a target speed at a target position of the train, by using a travel distance from the current position to the target position of the train, an altitude difference between the current position and the target position, a braking force of a brake device of the train, first potential energy including an influence of an altitude difference based on a gradient of the track in a section from a head position to a tail position of the train at the current position, and second potential energy including an influence of an altitude difference based on a gradient of the track in a section from a head position to a tail position of the train at the target position.