If you have rail standards of the 21st century cellular is absolutely what you should be using for rail see: GSM-R . Apparently the DOT is even looking at this.
Now you’d need to build cellular infrastructure along your lines for that system. US rail owners are terminally uninterested in building or maintaining rail infrastructure so that’s not particularly likely to happen unless mandated.
If you have rail standards of the 21st century cellular is absolutely what you should be using for rail see: GSM-R . Apparently the DOT is even looking at this.
Now you’d need to build cellular infrastructure along your lines for that system. US rail owners are terminally uninterested in building or maintaining rail infrastructure so that’s not particularly likely to happen unless mandated.