Helping the rail industry improve design and durability through rapid modelling and analysis of gearbox, transmissions and drivelines.

We help rail companies achieve decreased costs and downtime for them and, in turn, more reliable, comfortable journeys for their passengers. We do this by helping rail companies, operators and suppliers to improve design and durability, and focus on efficiency, NVH issues (noise, vibration and harshness), and failure and root cause analysis work through a range of award-winning design software and services.

Romax Railway Simulations

Our software and services can help you with:


Total System Modelling

Housing/Structure Influence

Component Analysis

Dynamics and NVH

SIMPACK enhancement

Gearbox Analysis

Bearing Design Analysis

Failure Investigation

Due Diligence




Case study on Problem Investigation

Requirement: investigate railway axle box failure

Services provided: examine the causes of bearing failures; explore analyses previously carried out by other companies/consultants. Our experts identified failure modes that indicated bearing misalignment was causing the problems; assembly tolerance errors had resulted in abnormal loading that previous analyses had not accounted for

Requirement: To investigate the effect on the system of the motor short circuit events.

Services provided: Romax investigated designs and identified stresses on the gearbox Torque Reaction Link (C Bracket) caused by motor short, and provided the customer with an assessment with recommendations.



Case study on Transient Shock Load Events

Case study on Gear Failure Investigation

Requirement: To identify the root causes of the fatigue problem through advanced simulation and gearbox design expertise and provide recommendations to the customer on how to overcome the problem.

Services provided: Romax conducted a detailed inspection of the transmission in the train depot and from this created models of the transmission from data and drawings supplied by the customer. We were able to validate the gear contact pattern with the virtual model and actual transmission, and conduct a durability analysis using measured load data, and analyse the impact of bearing end-float and gear micro-geometry. Our success of this project led to a subsequent project to carry out a duty cycle analysis on the same train operating on a different line.