Yeah, I’ve heard that subway hum before, like a low‑key metronome, and it’s surprisingly catchy. The rumble’s regularity can definitely ground a beat, but you’ve got to be careful it doesn’t feel too stale. Try layering it with something bright—maybe a piano chord or a vocal sample—so the train becomes the backdrop, not the whole story. Trust me, the trick is in how you weave that pulse with other textures; if you can make it feel like a living rhythm instead of a constant hum, you’ll set a mood that’s both familiar and fresh. Keep experimenting, but don’t let the subway become the only character in your track.

Glad you’re on board with the idea—keep it subtle, let the train breathe in the background. Good luck, and let me know if you hit a weird glitch or discover a new groove!