What is an analogy for microtubules ?

What is an analogy for microtubules ?
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Microtubules have two main functions in cells and in doing so act like a skeleton as well as like railroadtracks. Microtubules are the main structural component of the cytoskeleton in cells, which provides the cell with structure and rigidity and determines the shape of the cell. They also serve to transport vesicles and proteinswithin the cytoplasm through transport proteins called kinesins and dyneins, which act much like railroad cars.   
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Description : Endoskeleton of a cell is made up of (A) Microtubules (B) Microfilaments (C) Intermediate filaments (D) All of these

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Which of the following are regularly assembled and disassembled during cell cycle. (A) Microtubules (B) Intermediate filaments (C) Both A and B (D) None of these

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Microtubules consist of helically stacked molecules of the protein (A) Actin (B) Myosin (C) Keratin (D) Tubulin

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