45050 - L&YR Dynamometer Car

45050 – L&YR Dynamometer Car

Built in 1912 by the Lancashire & Yorkshire Railway, 45050 is a rare and historically significant engineering vehicle designed to measure and record locomotive performance. Unlike a standard passenger coach, the dynamometer car houses a central table fitted with chart recorders and instrumentation that tracks parameters such as drawbar pull, train speed, distance, gradient, and fuel and water consumption as the train moves.

Today, 45050 is part of the Trust’s static display collection, where it stands as a fascinating artifact of early 20th century railway engineering. It gives visitors a rare window into how railways measured and calibrated the power and efficiency of steam locomotives in their heyday.

Quick Facts

• Number: 45050
• Type: Dynamometer Car
• Builder: Lancashire and Yorkshire Railway - Horwich Works
• Year Built: 1912
• Purpose: Locomotive and rolling stock performance testing
• Current Status: Preserved
• Owner / Location: The Princess Royal Class Locomotive Trust - West Shed

Design & Features

45050 was engineered to provide precise data for locomotive testing and development. Key features include:

• Instrumentation to measure drawbar pull, horsepower, and tractive effort
• Speed recording equipment and onboard plotting devices
• Observation areas for engineers and testing crews
• Robust construction to withstand the stresses of high-speed test runs

Service History

During its working life, 45050 was attached to various test trains across the British Railways network. It was used to evaluate new locomotive classes, modifications to existing engines, and the performance of rolling stock under load. Data collected from this car contributed to design improvements and performance assessments for the BR Standard locomotives and other classes.

Preservation

Following withdrawal from active testing, 45050 was preserved due to its historical and technical significance. It is now maintained in near-original condition and is displayed at heritage railways alongside operational locomotives. While not regularly used for testing today, it remains an important educational and historical exhibit illustrating mid-20th-century railway engineering practices.

Highlights & Notable Moments

• Instrumental in testing the performance of BR Standard and other steam locomotives
• Recorded data that influenced locomotive design and efficiency improvements
• One of the few surviving British Dynamometer Cars from the steam era
• Displayed at heritage events as an example of technical innovation in rail history

Current Condition

45050 is preserved in excellent condition, with instrumentation and interior features restored for display. Heritage railway visitors can view the carriage to gain insight into the testing and development of mid-20th-century British locomotives.