© Don Marshall 2015
Class W1 No 10000. This is the locomotive in its original form. Designed by Sir Nigel Gresley in conjunction with Yarrow and Co who specialised in high pressure boilers and was developed in some secrecy hence the term "Hush Hush" adopted by the media at the time. It was introduced in 1929 and remained in this form until 1936 when it was rebuilt into a more conventional locomotive. (see the rebuilt form in the LNER  list). The locomotive was only ever an experiment and it took most of the five year period to get it into an efficient machine. The aim was to provide a more efficient use of steam and not to produce a more powerful locomotive.

No 10000 did perform very well in the later stages and was used on the Flying Scotsman on several occasions. However it was a one off and when heavy repairs were due in 1935 Gresley decided that the experiment was over.

The tender is still in existence being coupled to the preserved A4 No 4488 Union of South Africa.
London & North Eastern Railway