2230 was fitted with the larger boiler when new, but this was unsuccessful and was quickly altered.

In the final batch the drop in the front framing above the cylinders was curved, the cylinders were also lower, superheaters and top feed were fitted from new.

[5] Their large four coupled driving wheels were suited to high speed running on outer suburban services but acceleration was slower than that of the six coupled, smaller wheeled locomotives.

Like the Counties, they had a reputation for rough riding, caused by their short coupled wheelbase and large outside cylinders.

This article relating to steam locomotives operated in the United Kingdom is a stub.