The LNWR Improved Precedent Class or Renewed Precedent Class is a class of 2-4-0 steam locomotives originally designed for express passenger work. They later gained the nickname of Jumbos.

The locomotives were designed by F. W. Webb. A total of 158 were built in batches by Crewe Works 1887–1897 with two further additions in 1898 and 1901 respectively. They were officially "renewals" of 96 Newton Class and 62 Precedent Class locomotives. On renewal, they kept the numbers and names of their predecessors, and as a result the numbering system continued to be completely haphazard.

The London, Midland and Scottish Railway acquired 76 upon the grouping of 1923, and gave them the power classification 1P. The LMS assigned these the numbers 5004–79, in order of build date, though not all received them as withdrawals continued apace. By the end of 1933, only 5001 Snowdon survived and in April 1934 it was renumbered 25001 to clear the number 5001 for an LMS Stanier Class 5 4-6-0 but was withdrawn in October that year.

One has been preserved as part of the National Railway Collection.