<p>Micropiles refer to relatively smaller diameter piles with values typically ranging between 100 and 300&#xa0;mm. In recent years, these piles have gained significant popularity in retrofitting applications owing to smaller rig requirement during installation and minimal disturbance caused to the surrounding ground region. The benefit of these micropiles is that they can be installed within a very short period of time for large track lengths. All these characteristics make the micropiles highly suitable for capacity enhancement of existing railway tracks for higher speed and heavier axle load carrying capacity. In the present study, the benefits offered by the micropiles in existing tracks were assessed by conducting reduced scale (1/5) model tests under equivalent static wheel loading conditions. The bottom subgrade was made of weak clay soil and particle sizes of ballast and sub-ballast layers were reduced as per the scale. The scaled down micropile was casted in a hollow pipe with a reinforcing bar passing through the centre. The results of the model tests showed a reduction in settlement thus proving its efficacy as a retrofitting measure for railway tracks. A complete parametric study varying the geometrical parameters of the micropile under the wheel load conditions was also performed using finite element method (FEM) software MIDAS GTS NX (2016).</p>