One thing I'd recommend is bone conduction headphones paired with earplugs; it should work a bit better than normal noise canceling headphones because those dep

One thing I'd recommend is bone conduction headphones paired with earplugs; it should work a bit better than normal noise canceling headphones because those depend on relatively time-invariant noise to cancel. Trekz is the brand I use, and they tend to cost about $100: I guess that's about $1.50/hr after one month of use on your commute.