Each passenger car prototype has different window shapes, to test wind resistance for each type of design.

Newer sound dampening polyester panels held in place by steel casings are attached to walls along the track; they are also weatherproof (as older designed absorbed water when raining or snowing, limiting their effectiveness).

[9] The train was first observed running at the announced top planned test speed of 400 km/h (250 mph) on 14 December 2019.

[13] In January 2025, The Hindustan Times reported, citing anonymous sources, that the production version of the ALFA-X, know as the E10, may simultaneously enter service in Japan and on the Mumbai-Ahmedabad high-speed rail corridor in 2029 or 2030.

[14] The International Railway Journal, however, claimed on the contrary that Japan was "reportedly unwilling to offer the new-generation Shinkansen to India".