There are many issues surrounding the performance of critical assets on high-speed ballasted railway lines.At assets like switch & crossings and bridge transitions high track forces can be produced resulting in higher ballast settlements and hence track misalignments.The latter result in higher track forces and hence more settlement,leading to the need for increased track maintenance to ensure comfort and safety.Current technologies for solving issues like ballast movement under high-speed loading regimes are limited.However,a technique that has been well used across the UK and now increasingly overseas to stabilise and reinforce ballasted railway tracks is the application of in-situ polyurethane polymers,termed XiTRACK.This paper discusses how this technique can be used to solve these types of long-standing issues and presents actual polymer application profiles at two typical critical sites,namely a junction and a transition onto concrete slab-track. There are many issues surrounding the performance of critical assets on high-speed ballasted railway lines. At assets like switch & crossings and bridge transitions high track forces can be produced resulting in higher ballast settlements and hence track misalignments. Latter latter result in higher track forces and therefore more settlement, leading to the need for increased track maintenance to ensure comfort and safety. Current technologies for solving issues like ballast movement under high-speed loading regimes are limited. However, a technique that has been well used used across the UK and now increasing overseas to stabilize and reinforce ballasted railway tracks is the application of in-situ polyurethane polymers, termed XiTRACK.This paper discusses how this technique can be used to solve these types of long-standing issues and presents actual polymer application profiles at two type critical sites, namely a junction and a transition onto concrete slab-track.