TheStreet's Jim Cramer answers questions from his Twitter followers on the floor of the New York Stock Exchange. Cramer says he likes CSX because it is cheap while Norfolk Southern is breaking out due to increased shipments of natural gas. Cramer prefers Norfolk Southern because of its momentum. When asked about First Solar being down, Cramer says Australia cutting back its subsidies for solar power worries investors. But Cramer says investors should buy First Solar because the stock is trading at 12 times earnings and the company has a great technology and pricing model. Finally, Cramer says he does not like the storage and security group in general, specifically Symantec and FireEye. Tweet your questions to Cramer using #CramerQ and he will answer them every Monday at the New York Stock Exchange.