Time Railroad

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See also: Kosane Kiriha or the Homo magica.

The Time Railroad is a major plot device in Null Magical Girl across all three volumes. The Railroad takes Kosane 800,000 years into the future to meet the Homo magica and see the consequences of the Incubators. The Train is powered by a coal-like substance similar to other steam engines. The Train that operates on the Time Railroad is Time Loop Railroad Express 107 (時間循環鉄道　特急ふ〇七, Jikan Junkan Tetsudou Tokkyuu Fu-Maru-Shichi). The railroad was made by the Homo Magica as a way to take over the cosmos in every time period, not just their own.

• In volume 1, the Time Railroad is traveled to through Eruna's gift to Kosane (a ticket) that leads to Kosane and Kyubey to the Train, causing her to go unconscious due to attacks by the Homo magica.
• In volume 2, the Time Railroad appears again as Kosane desperately tries to escape from Eruna. By overflowing the Train with the fuel, the Railroad explodes and fuses Kosane, Kyubey and the Railroad.
• In volume 3, the Time Railroad gives Kosane the power of time travel and looping, allowing Kosane to travel all throughout time and repeat 2021 over and over again. She also gains the power to alter the reality of the Universe by travelingf back in time to see the symmetry chrysalis of the universe.

The Time Railroad is representative of the 4th Dimension Theory, in which the 4th Dimension is theorized to be time itself. This is seen directly in volume 1, with the ticket becoming a 5-cell, a 4th-dimensional shape, in order to transport Kosane and Kyubey to the Time Railroad.