Nobody should have any illusions, phones are part of a child's literal sense of identity these days. You aren't getting them to look up from them without a struggle. Far easier to turn that engagement into an advantage.
I agree that people aren't necessarily going to download an app for a single visit to a railway that they may not ever visit again.
To repeat, this is literally not how young people use apps.
They see a need (such as being told they are going to Railway X), they search for the app, install it and use it.
Searching and installing an app is as easy as searching Google for a website. Arguably it may even be easier, since Google serves you up every conceivable mention of the search time, and not all websites are smart enough to know they are being served to a mobile phone.
Once installed, which takes seconds, they expect the app to be intuitive and genuinely useful, engaging and fun, because that is the the standard. A museum panel in your pocket, is neither engaging or fun.
They do not care whether they never use it again, or will only be using it in six months time, because for all but their daily apps, they simply uninstall it. This is their routine.
These are all one click actions.
One click to open an app store. Type "KWVR". Click the install button. Click to start the app.
Use it.
One click to uninstall.
They live and breathe this stuff. Websites, not so much. Perhaps only for activities deemed very boring, like homework research.