The photo of 68078 is a good guide to the differences to be found on the Austerities and the alterations made to the J94's by LNER/BR :
a, 68078 was built by Andrew Barclays and the handrail on the side of the saddle tank is mounted higher than Austerities from the other builders; because of this the extra handgrip above the step is nearer to vertical than the J94's from other builders.
b, The handrail pillars on 68078 are made of plain round bar as fitted to the WD 2-8-0s/2-10-0s, these were fitted to all Austerities except those built by Hunslet from late 1944 onwards.
c, The footplate steps on 68078 are typical of the thirty J94s that were allocated to the Eastern Region, these were all dealt with by Gorton Works until the late 1950s. If you look closely you will see that the front and rear steps have the ends slightly angled to stop feet from slipping off the step, however, the extra middle steps added by LNER/BR have vertical pieces welded on. This applies to most of the ER based j94s. The fortyfive locos based at ex NER sheds had the vertical pieces added to all the steps.
d,Another modification on many of the J94s was the fitting of a smokebox doorstop on the smokebox front, again look closely at the photo of 68078 and you will see two bolts on the edge of the smokebox front near the door hinge where the doorstop was fitted.
Austerities built by Hudswell Clarke have another addition which is easily missed, they have two triangular lifting lugs fitted to the tank top, one is fitted between the chimney and the water filler and the other between the dome and the cutout for the whistle.
It is well documented that the J94s sent to the Cromford and High Peak section were fitted with oval buffers because of the sharp curves of that route; but the locos allocated to Bidston shed for working in Birkenhead Docks were also fitted with oval buffers.