Wow, I've never been on a train but I need to do a train trip asap! I love nature and road trips and that's like the perfect combo. Now in regards to the topic haha:
I agree, you can't turn off your senses, only remove your attention. When they are talking about emptiness they don't mean it literally in the way we think. Thoughts and senses are still registering. It's more of an emptiness of striving towards or avoiding them. Like you said at the end, you weren't analyzing. Once we look backwards and say "that just happened to me" and we try to understand and own the experience we fall out of the now. I think we are on the same page, just with different terminology that makes sense to us individually.
What I'm trying to understand now is how I'm not actually my body or brain, I'm just experiencing them. I've had moments where I felt completely clear in understanding how to move and act spontaneously and it was so freeing and amazing. Moments where the world spoke to me in an intuitive way. Those types of moments spur me to learn and dig into myself to find out what I really am.
Looking forward to more conversations with you!