From Anime News Network:
The official website for the Ressha Sentai TōQGer announced on Monday that the Ressha Sentai TōQGer Vs. Kamen Rider Gaim Haru Yasumi Gattai Special (Train Sentai TōQGer Vs. Kamen Rider
Gaim Spring Vacation Combining Special) will air on March 30 from 7:30
to 8:30 a.m. According to the website, this will be the first
full-fledged "dream" television special matchup between the Super Sentai and Kamen Rider franchises. (The two franchises have had film crossovers, and the casts of Samurai Sentai Shinkenger and Kamen Rider Decade co-starred in two episodes in each others' series.)
This will be the first time that the Ressha Sentai TōQGer and Kamen Rider Gaim casts are co-starring together. Plus, three Showa-era Kamen Riders — the original Kamen Rider 1, Kamen Rider 2, and Kamen Rider V3 — will also appear in the special, and the heroes will "confront a new, strongest-ever enemy!"
Not coincidentally, the next Kamen Rider and Super Sentai crossover film, Heisei Rider vs. Showa Rider: Kamen Rider War feat. Super Sentai, will open in Japan one day before the special. Kamen Rider Gaim premiered last October, while Ressha Sentai TōQGer premiered on February 16.