I am interested in knowing if biodiesel can be a feedstock for gasoline production.

Because much of the energy in corn-based ethanol comes from burning hydrocarbons in the first place, the cleaner tailpipe emissions are actually just the tip of a very dirty iceberg. If an ethanol distillery is fired by coal (which many are) rather than natural gas, the fuel that it produces will actually contribute more to changing the climate than regular gasoline. And don’t forget all the fertilizer dumped on the fields! When it is exposed to the weather, the nitrogen in the fertilizer generates nitrous oxide, a greenhouse gas 296 times more damaging to the climate than CO2.
One study shows that biodiesel derived from from palm oil grown in Indonesia is in fact 10 times more damging to the climate than conventional diesel. Meanwhile, it is expected that the Indonesian rainforests will be 98% gone by 2022, cleared away in order to make room for this supposedly "green" fuel. Another study calculates that clearing forest to plant biofuel feedstock results in carbon emissions as much as 400 times wrose than conventional oil!

I need to heat up the rail car carrying biodiesel or feedstock. What is the main differences between these two? Which is better (specs)? Which is less expensive to operate?

With fuel prices going up do you think that biodiesel can make it right now? Will higher feedstock prices outweigh the increased cost of biodiesel?