Not necessarily so Jim. If the loco was set up with the combined steam brake valve and vacuum ejector, then the tender could be steam braked. Conversely if the engine was vacuum only, then the tender had to be vacuum.
If all the early Saints were vacuum engines then the tenders had to be vacuum. ie the Dean 4000 gal had to be converted to vacuum. Which they were or some were.
An 2251 engine, which were steam braked engines, could have a vacuum tender as they were fitted with the combined steam/vacuum brake system. see the link to 2251 photos earlier.
You will see the steam part of the brake above the vacuum. There is a drawing of all this in GWRJ.
Now a little puzzle. There is three photos of 38xx loco in RC Riley's first book, taken by WL Good. I think two of the are Dean 4000 gal tenders. Only judged by the height of the hand rail in relation to the cab cut out. The third photo is of a 3500 gal tender which is much lower.
The puzzle is that the 4000 gal tenders are attached to loco's of the first batch. These were fitted with steam brakes. The brake hangers are in front of the driving wheels, and they had outside pull rods, probably double which pulled to the back, with steam cylinders, as did the Dean era 4-4-0's.
The later batches were like normal Churchward Saint's and Star's with a vacuum cylinder up front.
Now were those tenders steam braked, as were the loco, or were the loco's fitted for both systems.
Has anybody seen a photograph, or point me to a photograph, of the inside of the cab of one of the first batch of the 38xx?
M Early has a photo of a later batch, which has vacuum brake only. This then meant generally 3500 gal tenders or a convert.
Incidentally the GA on HRM web site says that the first two batches were the same. Photographic evidence does not bare this out!
I am away from home so can not give references.
Richard Ashenden