Paul has been involved with modular railway modeling since 1974 when he built an Nn3 NTRAK module for the NMRA national convention in San Diego. He subsequently became the first Modular Standards Chairman on the NMRA national engineering committee and modular layout coordinator for the 1977 PCR and 1981 National conventions.
Paul developed the Interail modular standards that pioneered ideas now embraced by Freemo, One Trak and the European NEM modular recommendations.
Always having international railway interests, Paul has built layouts with Swiss, British, and Canadian themes as well as his current AsiaNRail modules.
For over 20 years, Paul was the owner of Interail/Intermodel and designed and manufactured the first N scale double stack container cars and related intermodal models in the 1970s to 90s.