The LNER Class J64 was a class of three steam locomotives of the London and North Eastern Railway.
They were built by Hudswell Clarke for the Mid-Suffolk Light Railway and were acquired by the LNER when it took over the Mid-Suffolk in 1924. Number 3 was withdrawn immediately and never received an LNER number. Nos. 1 and 2 were renumbered as LNER 8316 and 8317 respectively.
The dimensions for Nos. 1 and 2 are shown in the infobox (right). Dimensions for No. 3 are not known but it is believed to have been similar to No. 1, except that the cylinder bore was .
Withdrawal dates were:
None of the locomotives are preserved.