Facility Overview

• Technical University Darmstadt, Germany - world's most useful model railway
• Started 2006, similar facility since 1936
• 500 square metres training space
• 1.2 kilometres fictional track layout with fictional station names
• Stations named after persons who helped develop facility
• Trains actual signalmen, conduct exams

Mechanical Interlocking System (Oldest Deutsche Bahn System)

• Everything worked manually
• Blue levers for points, red levers for signals
• Physical lever operation turns model points via computer simulation
• Real-world equivalent: levers pull through pulleys/levers to physically switch points
• Route locking system (German-specific safety feature)
  • Must use correct route lever (e.g., P2 for points 1,2,7,8,9,10)
  • Lever checks all points set correctly
  • Physically locks all points to prevent movement
  • Wrong lever selection results in physical lock - cannot operate
• Signal operation sequence:
  • Set points in position
  • Engage route locking interlock
  • Set signal to off position (green)
  • Train driver sees green signal, can proceed
• Line blocking procedure:
  • Lock line to prevent following trains
  • Notify next signal box of train on line
  • Generate electricity by pulling button down 10 times
  • Sends bell signal to next signal box

Electromechanical Interlocking (1950s Technology)

• All-electric interlocking, 50 years newer than mechanical
• Visual track display showing all tracks and point directions
• Red arrow indicates train intersection marker
• Train stops at red entry signal
• Two-button operation for point control
• Entry-exit operation for signal control
• Safety requirements:
  • Flank protection: prevents trains from rolling into active route
  • Overlap protection: reserves space beyond exit signal in case train doesn't stop
• Must operate multiple points for complete safety:
  • Main route points
  • Flank protection points
  • Overlap points
• Entry-exit operation: simultaneous button press at entry signal and destination track
• Green light indicates train can enter (1-2 minute delay)
• All electrical circuits and relay interlocking (no microcontrollers)

Computer Interlocking (Modern System)

• Future of railway signaling
• Will replace all mechanical interlockings
• Train identification by number (e.g., Train 201)
• Mouse-based entry-exit operation
• Two mouse clicks replace multiple lever operations:
  • Click red triangle (exit signal)
  • Click blue destination point
• "Verarbeiten" (OK) button confirms operation
• Computer performs all interlocking checks automatically
• All points move simultaneously
• Signal changes to green automatically
• Visual feedback: lights turn red when train occupies section
• Single operator can manage 2-5 stations simultaneously

Training Philosophy

• Physical model provides superior learning experience vs. screen simulation
• Visual overview of entire situation during disruptions
• Physical railway crashes stay in memory (even model trains)
• Comprehensive view vs. focused screen view during disruptions
• Maintains all safety checks across all system generations