A Certain Scientific Railgun T anime’s official website announced on Saturday that the episode was planned to air on April 24 however rather the anime’s thirteenth episode is postponed due to the Coronavirus disease (COVID-19) circumstance.
A Certain Scientific Railgun is a Japanese manga arrangement composed by Kazuma Kamachi and outlined by Motoi Fuyukawa, which started serialization in the April 2007 issue of ASCII Media Works’ Dengeki Daioh magazine. The manga is a side project of Kamachi’s A Certain Magical Index light novel arrangement, occurring previously and during the occasions of that arrangement. The manga is authorized in North America by Seven Seas Entertainment, who started distributing the arrangement from June 2011.
Source: A Certain Scientific Railgun T Official Website