Trevally Engineering Ltd
ABOUT
Andrew Knowles MIET
Principal Rolling Stock Engineer
Andrew is a Rolling Stock Engineer with over 15 years’ experience delivering consultancy projects that enhance the performance, safety, and reliability of passenger fleets across the UK. His expertise covers engineering change, maintenance optimisation, obsolescence management, technical authoring, and supplier support, with a strong track record of guiding complex projects from concept through to delivery.
Before founding Trevally Engineering, Andrew held senior engineering roles with TOCs and rolling stock consultancies, contributing to major fleet enhancement programmes and electrical design projects. Today, he provides flexible and cost-effective consultancy support to operators, ROSCOs, and suppliers, helping them solve technical challenges and achieve measurable improvements in fleet performance.
Andrew has worked on a wide range of EMU and DMU fleets. This breadth of experience allows him to approach problems from both a technical and operational perspective, ensuring solutions are safe, compliant, and cost-efficient.
What drives his work is delivering practical, professional consultancy that helps clients overcome challenges such as optimising maintenance regimes, resolving obsolescence, or introducing new technologies into service. His goal is to provide engineering solutions that add lasting value; keeping fleets reliable, cost-effective, and safe throughout their lifecycle.
Fleet Experience
Siemens - Desiro-City EMU (Class 700 & 717)
Bombardier Transportation - Electrostar EMU (Class 377 & 387)
Bombardier Transportation - LU Stock EMU (VLU 09)
Bombardier Transportation - Turbostar DMU (Class 170 & 171)
British Rail - Suburban EMU (Class 313, 455, 507/508)
British Rail - Networker Express EMU (Class 365)
British Rail - Mk3 - Second Generation EMU (Class 442)
British Rail - Sprinter DMU (Class 150 & 156)
Contact Andrew directly at: andrew.knowles@trevallyengineering.com
Leah Megson-Gray
Marketing Manager / Administrator
Leah is Trevally Engineering’s marketing manager and administrator, bringing over a decade of experience in sales, marketing, and social media with some of the world’s best-known consumer brands. Her career includes work with Red Bull, Nestlé, Danone, Ferrero, Müller, McCain, and Green King, where she developed a reputation for delivering bold, creative, and results-driven campaigns.
Before working with Trevally Engineering, Leah held senior roles as a Senior Client Manager, Area Sales Manager, and Field Capability Trainer, giving her a broad perspective on how to build, manage, and communicate strong brands. Alongside her own marketing projects, Leah now works with Trevally Engineering, providing flexible marketing and administrative expertise that supports the business’s growth and client engagement.
Her focus is on creating fun, professional, and effective marketing strategies that help Trevally Engineering communicate clearly with clients and showcase the value of its services.