The Earth’s plasma environment contains energetic particles trapped by the planet’s magnetic field, forming two radiation belts. The outer belt consists mainly of energetic electrons, which often show sudden increases in intensity at its outer edge. These increases have typically been explained by acceleration caused by changes in the magnetic field or interactions with electromagnetic waves, but these explanations cannot account for how electrons are accelerated from a few tens of electron volts to tens of kiloelectron volts. In this study, we show that such rapid electron enhancement can be explained by fast radial transport driven by the recently proposed drift-orbit bifurcation mechanism. This process moves electrons rapidly across radial distances, allowing significant radial displacement within a few hours. Our findings advance the understanding of electron dynamics near the magnetopause and highlight the broader significance of drift-orbit bifurcation in electron transport.