Hi, FS.
Not sure that I understand your question exactly, but you may or may not be aware of this relevant aspect of relativity:
When an object moves, its mass increases. The faster it moves, the greater it's mass, and so the greater the energy required to make it go faster; as it approaches the speed of light, its mass rises toward infinity. To reach the speed of light, at which point it would have infinite mass, it would require infinite energy. That, of course, is not possible, and so it can never reach that speed.
Particles at facilities like LHC (CERN) are accelerated, at great cost in energy, to near light velocity, and gain many times their 'rest' mass. But even an electron cannot reach the speed of light (in a vacuum). That too, as small as it is, would require infinite energy.
