Fig 4. Online searches for train through Google as of January 2020, split per continent.
North America (orange), South America (yellow), Asia (red), Europe (light blue), and Oceania.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.