I would also be afraid to whip out some of those you listed on a train. Too fragile and big. I'd go with something far more durable and compact like the Shure SRH840/940 or ATH M50.
I've come really close to buying a HeadRoom amp many times as I really want to try their crossfeed. I think I would really enjoy it for a lot of the jazz I listen to it. HOWEVER, as some have already mentioned, I feel they are just way...
My M50s were purchased in December of 2010 and I used them with the factory ear pads for about 10 months or so before I really started looking for alternatives. I use these mostly at work and some days for about 5 or 6 hours. The pads...
I wonder if the new gold plugs will fix that. Seems like they can't make up their minds with their product line. Changing the graphics, changing the plugs, changing the names now.
Headroom manages it in their Bithead and Airhead. You're right though that crossfeed is rare, unfortunately. Practical Devices also uses it and they aren't terribly expensive.