A text-based HUD was used before version 2.2.0 was released. It looks similar to the following:

 [F] {B - >o< +} >|< >|<
Speed: |++++___________|> 15 km/h
Manual operation

The display shows:

• The text that is normally shown inside the train, if any.
• The driving direction: [F] when driving forward or [R] when driving in the reverse direction.
• The lever of the train:
  • >BB< when the emergency brake is applied
  • >B< when the normal brake is applied
  • >-< when the train rolls to stop
  • >o< when the speed of the train is constant
  • >+< when the train accelerates
• The doors that are open:
  • >|< >|< when doors on both sides are closed
  • |<>| >|< when doors on the left side are open
  • >|< |<>| when doors on the right side are open
• The current speed of the train: four + show that the train moves at 4m/s (15km/h)
• An S in the speed indicator when shunt mode is active
• The operation mode of the train:
  • When the train is manually controlled, Manual operation is shown
  • When ATC is active:
    • The target speed is shown similarly to the current speed of the train
    • The ATC command and delay (if any) is shown after the ATC target speed
  • When LZB is active (e.g. when the train is approaching the end of the track) and the train is manually controlled, -!- Safety override -!- is shown.

The graphical driver HUD is introduced in commit a88e5aad64089eb4cf228d32a0eee812f1d7c5c6 to the master branch. It has been modified multiple times to its current state.

The HUD shows:

• The speed in m/s indicated by the two-digit 7-segment display.
• The driving direction of the train (“Forward” or “Reverse”)
• The lever of the train:
  • “EMG” for emergency brake
  • “B” for normal brake
  • “R” for roll
  • “N” when the speed of the train is constant
  • “P” for acceleration (power)
• “ATC” when ATC is active
• “LZB” when LZB is active
• “Shunt” when shunt mode is active
• The signal aspect of the next signal:
  • A red square when the next signal is red or when the train approaches the end of the track
  • An orange square when the next signal has speed restriction higher than 0m/s
  • A green square when the next signal allows proceeding without speed restriction
• “Left Door” or “Right Door” when the door on the left or right side of the driving direction is open
• The speed of the train shown as a white bar
• The speed current speed limit of the train (if present) shown as a red vertical bar
• The speed restriction of the next signal (if present and greater than 0m/s) shown as a red triangle pointing down
• The ATC target speed (if present) shown as a cyan triangle pointing up

Passengers only see the text shown inside the train.