The Myth of the Three-Way Tunnel and Its Creation in Shotcut

Published on January 07, 2026 | Translated from Spanish
Visual representation of a railway tunnel divided into three tracks with differentiated lighting effects: sepia for the past, normal colors for the present, and bright distortion for the timeless dimension.

The Myth of the Three-Way Tunnel and Its Creation in Shotcut

The fascinating legend of the three-way tunnel originated in the late 19th century, coinciding with the massive expansion of railway networks in Europe and North America. 🚂 Accounts from workers described sporadic apparitions of mysterious tunnels that only manifested under specific weather conditions, such as thick fog or full moon nights. Steam locomotive drivers reported encounters with impossible bifurcations, where a single track split into three distinct directions, associated with inexplicable disappearances of entire trains. 🕰️

Historical Evolution and Cultural Symbolism

Throughout the 20th century, the myth was enriched with elements technically impossible according to conventional railway engineering. Each track represented a different temporal dimension: the left one transported to the past, showing landscapes and stations from previous eras; the central one maintained the present reality; and the right one led to a timeless reality, devoid of hours or years. Choosing incorrectly caused a progressive disintegration of the train, starting from the rear cars until reaching the locomotive.

Impact on popular culture:
  • Influence on literary and cinematic works about time travel and parallel realities
  • Representation of human fascination with destiny and life choices
  • Symbol of the fear of the unknown during the industrial era
The physical impossibility of a triple bifurcation in a real tunnel adds an enduring mystery, symbolizing the paths of life and their unpredictable consequences.

Project Preparation in Shotcut

To recreate this phenomenon, start Shotcut and set up a new project with 1920x1080 resolution at 30 fps. Import three essential clips: a real railway tunnel, a moving train, and varied landscape shots to represent each dimension. Organize the video tracks in overlapping layers, assigning the bottom one for the base tunnel and the upper ones for the bifurcation effects. Set markers on the timeline to indicate the track division points.

Key initial setup:
  • Full HD resolution for maximum visual clarity
  • Track organization in layers for precise control of effects
  • Temporal markers to synchronize the triple split

Modeling and Advanced Visual Effects

Use the square mask filter to generate the illusion of three diverging tracks inside the tunnel. Apply perspective transformations to each segment to simulate depth and distinctive direction. For the past track, add a sepia filter with smooth motion blur; the present track keeps the original colors, and the timeless track receives a temporal distortion filter with partial freeze effect.

Implementation details:
  • Custom perspective transformations for each track
  • Sepia filter and blur for the past dimension
  • Temporal distortion and freeze for the timeless reality

Lighting and Atmospheric Effects

Adjust the lighting using the levels and curves filter to create dramatic contrasts between the three tracks. The past track features dim lighting with yellowish tones; the present track maintains standard lighting; and the timeless track uses brightness and extreme saturation effects with random flickers. Apply the ambient light filter to unify the scene, preserving subtle differences between dimensions.

Lighting adjustments:
  • Dim lighting and sepia tones for the past
  • Extreme brightness and saturation with flickers for the timeless
  • Ambient light filter for visual cohesion

Special Effects and Rendering Process

For the progressive disintegration effect, combine the particles filter with opacity fade on the cars. Program keyframes to control the disintegration evolution from the rear to the locomotive. Incorporate differentiated ambient sound effects for each track and mix with Shotcut's audio engine. Export the final project in MP4 format with H.264 codec and 15 Mbps bitrate to ensure maximum quality.

Essential final steps:
  • Use of keyframes to control disintegration
  • Mixing of dimensional sound effects
  • Export in MP4 with high visual quality

Final Reflections and Practical Application

The myth of the three-way tunnel not only endures as a fascinating cultural legend, but also offers a creative basis for exploring advanced visual effects in software like Shotcut. Recreating this phenomenon allows experimentation with modeling, lighting, and rendering techniques, while also symbolizing the importance of choices and their consequences in visual narrative. Whoever chooses the wrong track in the legend might as well have updated their dimensional GPS, but in practice, this project demonstrates the power of editing to bring the impossible to life. 🌌