The Amazing RTS Bus!

The Rapid Transit Series (RTS) bus emerged in 1977 from GMC's Truck and Coach Division in Pontiac, Michigan, representing a significant departure from previous transit bus designs. It was conceived as GMC's contribution to the 'Advanced Design Bus' initiative, a program aimed at modernizing urban transit. The RTS was a direct descendant of GMC's prototype for the U.S.

Department of Transportation's ambitious Transbus project, which sought to create a standardized, accessible, and futuristic city bus. Unlike its predecessor, the GMC New Look, which featured a curved windshield but flat side panels, the RTS boasted a distinctive, almost automotive-like aesthetic with smoothly curved body and window sections. This futuristic styling was not merely cosmetic; it was part of an effort to create an interim solution that bridged the gap between high-floor buses and the low-floor designs that would later become the standard for improved passenger boarding and accessibility.

The RTS's innovative form factor immediately set it apart in the urban landscape.

Perhaps the most profound legacy of the RTS bus lies in its contribution to passenger accessibility. While not a low-floor bus in the modern sense, the RTS design prioritized making public transit more user-friendly for a wider range of passengers. The emphasis on smoother lines and potentially improved step heights, compared to earlier models, was a crucial step in the evolution of transit vehicle design.

This focus on accessibility was not just about convenience; it was about social equity, ensuring that public transportation could serve everyone, including the elderly, individuals with disabilities, and parents with strollers. The RTS's success in this area helped pave the way for future developments in low-floor technology and universal design principles in transportation. Its design philosophy underscored the idea that a city bus should be a welcoming and functional part of the urban infrastructure for all its inhabitants.

A key engineering achievement of the RTS was its modular design. This approach allowed for the efficient production of three different lengths: 30-foot, 35-foot, and 40-foot models. The use of standardized components across these variations simplified manufacturing, maintenance, and parts inventory for transit agencies.

This modularity contributed to the RTS's longevity and widespread adoption. Initially, the RTS was powered by robust Detroit Diesel Series 71 engines (available in 6- or 8-cylinder configurations) paired with reliable Allison V730 or ZF 5HP-500 transmissions. Over its production life, the RTS saw upgrades to its powertrain, incorporating later engine technologies such as the 6-cylinder Series 92 and the 4-cylinder Series 50 engines.

This adaptability in powertrain ensured the RTS could meet evolving emissions standards and performance demands throughout its service life.

The RTS bus enjoyed an exceptionally long production run, spanning over three decades and transitioning through multiple manufacturers. After GMC ceased production in 1987, the torch was passed to Motor Coach Industries (under its Transportation Manufacturing Corporation subsidiary), then to NovaBus in 1994, and finally to Millennium Transit Services (MTS) in 2003. Production ultimately ceased with the closure of MTS in 2009.

This extended manufacturing history is a testament to the RTS's enduring design and its continued relevance to transit operators. Even as newer, low-floor buses became prevalent, the RTS remained a workhorse in many cities. Its distinctive silhouette and its role in advancing bus design principles have left an indelible mark on the history of public transportation, influencing the aesthetics and functionality of buses still in service today.