I realize Texas Central Railway has made allusions to Japanese investors for their project, but what degree of possibility exists for the airlines themselves to invest in this mode of transportation? If HSR is faster and cheaper to operate and takes in the same or higher farebox revenue, why wouldn't the airlines consider investing? If you can't beat them, join them. Is there any legal barrier to entry for an airline to diversify their transportation portfolio? If shorter air routes are no longer as profitable for airlines, you would think they would consider another means of capturing that market with another, more profitable mode. Think of the advantages say United could achieve if they were the owner of the HSR line between Dallas and Houston: those flying internationally would have direct, seamless connection to the Metroplex as well as Houston. Think of the market share of the highly profitable international travel that can be taken from American at DFW--without even investing in international routes from there. Of course TCR has said they intend to connect downtowns, not airports, but airline investors would obviously change that.