Jim Cramer responds to viewers' questions on Twitter on the floor of the New York Stock Exchange. Cramer says the new EPA regulations will not affect CSX because railroad companies have longer than previously thought to comply with the regulations and governors are allowed to play a role. Cramer likes UPS competitor Union Pacific because it is a better-run company. Shares of Starbucks are trading in a tight range for the past quarter, but Cramer thinks CEO Howard Schultz will come out "with guns blazing" and announce that business is still good. Dunkin' Donuts has fallen back during the past month. Cramer says Dunkin Donuts has been stuck in a range lately but he notes that many restaurant chains have been stuck as well. Cramer thinks Dunkin' Donuts is a very good retailer but investors are being asked to be patient. Cramer is not crazy about retail stocks because he doesn't see the consumer on fire yet. If you have a stock question for Jim, tweet it to @JimCramer using #CramerQ every Monday morning.