"This month, suppliers share information on control valves, ‘green’ friction braking, truck-mounted brake systems, traction motor gear case seals and..." (Foran, 2021)
References:
Foran, Pat. (2021, June). Technology update: Wheels and brakes 2021. Retrieved from Progressive Railroading: https://www.progressiverailroading.com/mechanical/article/Technology-update-Wheels-and-brakes-2021--63649
Published on June 22, 2021