At W, the carriage has the most gravitational potential energy.
At X, the potential energy has been converted into kinetic energy, therefore, this is where it has the most kinetic energy, but the least potential energy.
At Y, it has accelerated again, it will have some potential energy.
At Z, it will lose potential energy once again as it will have been converted into kinetic energy.
Normally, the carriage will have lost some energy due to air resistance and friction. However, in exams, you can usually leave this out.
All that roller coasters are about is potential energy and kinetic energy... Remember that!
When working out the maximum speed of something on a roller coaster, think of the potential energy it has lost and the kinetic energy it has gained. Just use the formula for kinetic energy.
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