Contact JLP: 714.835.6355 or info@jlpatterson.com


Rail Engineering

J.L. Patterson & Associates, Inc. (JLP) is an industry leader in trackwork engineering. The firm has extensive experience in design of rail projects including light rail transit, commuter and freight rail. JLP’s design services include the preparation of plans, specifications and estimates (PS&E) design packages, as well as feasibility studies requiring conceptual design and analysis.

Our engineering professionals have a broad range of experience in all aspects of railroad engineering projects.

  • Passenger Corridors
  • Line upgrades, restorations, & abandonment
  • Mainline
  • Sidings & Shooflies
  • Industry Track
  • Yards
  • Bridge Design, Rating and Strengthening
  • Geometric Highway/Street Design
  • Right-of-Way Boundary Maps

Highway & Rail Transit Station Engineering

The JLP engineering staff has performed Project Management and/or Project Engineering functions on a wide variety of highway and roadway engineering projects, with services ranging from conceptual to final design. Such projects have involved preliminary design studies to determine optimum geometric layout, considering factors, such as traffic requirements, as well as right-of-way and utility constraints. Based on these preliminary studies, JLP engineers have generated project study reports; prepared plans, specifications and estimates; provided right-of-way engineering; and designed and coordinated utility relocation, as necessary.


  • At-Grade Crossings
  • Grading and Drainage

Structural Engineering

JLP applies our structural engineering expertise to railroad, highway, and pedestrian bridges, as well as other facilities typical of a rail station. Our structural experience includes designs for virtually all bridge types used in the transportation arena including truss, posttension or reinforced concrete box girder, segmental, plate girders, and precast / prestressed girders. As a firm based in California, JLP carefully considers seismic stability of all our projects. We provide seismic analysis and retrofit design of bridge structures.

  • Design/PS&E
  • Inspection
  • Independent Check
  • Rehabilitation
  • Load Rating
  • Seismic Analysis/Retrofit