LMS Coronation Class vs. LNER Class A4

Attribute	LMS Coronation Class	LNER Class A4
Builder	LMS	LNER
Designer	William Stanier	Nigel Gresley
Wheel arrangement	4-6-2	4-6-2
Introduced	1937	1935
Top speed	114 mph	108 mph

Introduction

When it comes to iconic steam locomotives in British railway history, two classes stand out: the LMS Coronation Class and the LNER Class A4. Both of these locomotives were designed for express passenger services, but they each have their own unique attributes that set them apart. In this article, we will compare the key features of these two legendary locomotive classes.

Design and Development

The LMS Coronation Class, also known as the Duchess Class, was designed by William Stanier for the London, Midland and Scottish Railway. These locomotives were built between 1937 and 1948 and were known for their distinctive streamlined design. The Coronation Class was intended for high-speed express services on the West Coast Main Line.

On the other hand, the LNER Class A4 was designed by Sir Nigel Gresley for the London and North Eastern Railway. These locomotives were built between 1935 and 1938 and were famous for their sleek, aerodynamic design. The Class A4s were primarily used on the East Coast Main Line for services between London and Edinburgh.

Performance

Both the LMS Coronation Class and the LNER Class A4 were renowned for their exceptional performance on the tracks. The Coronation Class locomotives were known for their power and speed, capable of reaching speeds of up to 100 mph. These locomotives were often used on prestigious services such as the Royal Scot and the Coronation Scot.

Similarly, the LNER Class A4 locomotives were also known for their impressive speed and performance. In fact, the Class A4 Mallard holds the world record for the fastest steam locomotive, reaching a speed of 126 mph in 1938. The Class A4s were used on services such as the Flying Scotsman and the Silver Jubilee.

Technical Specifications

When it comes to technical specifications, there are some differences between the LMS Coronation Class and the LNER Class A4. The Coronation Class locomotives were equipped with Stanier's patented taper boiler, which improved steam flow and efficiency. These locomotives also featured larger driving wheels for increased speed.

On the other hand, the LNER Class A4 locomotives were known for their innovative three-cylinder design, which provided smooth and efficient power delivery. The Class A4s also featured a streamlined casing that reduced wind resistance and improved fuel efficiency. Additionally, the Class A4s were equipped with Gresley's double-chimney exhaust system for better performance.

Legacy

Both the LMS Coronation Class and the LNER Class A4 have left a lasting legacy in the history of British railways. The Coronation Class locomotives were praised for their reliability and performance, serving on the rails for many years. Some examples of the Coronation Class have been preserved and can still be seen in operation today.

Similarly, the LNER Class A4 locomotives have become iconic symbols of British engineering and design. The Class A4 Mallard's world record for speed still stands to this day, cementing its place in railway history. Several Class A4 locomotives have also been preserved and are popular attractions at heritage railways.