The file typically refers to an unauthorized repack or archived version of Hmmsim Metro , a train simulation game focused on Seoul Subway Line 1 . The "Switchboard" portion of the name refers to a major update released by the developer, Jeminie Interactive , which added manual train startup procedures and interactive circuit breaker panels. Guide to the Switchboard Update

Insert the door key into the control panel and use the for opposite-side doors. Gameplay & Modes

: You can choose from three starting states: Initial (manual startup), Switchboard (preset state), or Complete (ready to drive).

Insert the and move it to the EB (Emergency Brake) position. Press the PanUS button to raise the pantograph.

: Use the Space Bar for the Deadman's Switch (DSD) while adjusting the Reverser with the Up/Down arrows.

This update introduced "Cold and Dark" starts, where you must manually power up the train using the switchboard. : The switchboard is located at the rear of the driver's cab.