Here in India we have an app named "Where is my train?". Local people use this app a lot when traveling by train. It's not government owned either and has no ad

Here in India we have an app named "Where is my train?". Local people use this app a lot when traveling by train. It's not government owned either and has no ads. Just throwing in here for some inspiration since I don't know the inner workings of that app. Edit: It uses nearby cell towers to estimate the location of train