I used to work with internet on trains, and the system was relatively simple by today’s standards. Not so much back then, but:
One carriage had UMTS/LTE and CDMA modems and a router that load balanced between the uplinks. Usually in the restaurant carriage, because there would only be one per train. It also had a short range wireless link in each end for other carriages to connect.
Each carriage that could potentially be in the same train had wireless clients in each end for connecting “upstream” towards the router.
All carriages had a wifi radio
On other words, many potential points of failure. And sometimes we’d get tickets such as this sent our way: “Internet doesn’t work”
Bingo.
I used to work with internet on trains, and the system was relatively simple by today’s standards. Not so much back then, but:
On other words, many potential points of failure. And sometimes we’d get tickets such as this sent our way: “Internet doesn’t work”