GWR Holden 101 New build
Hornby Class 101 Tank Engine is real
Probably information over-load, but the following is taken from the RCTS bible:-
Engine No. 101 - Swindon Works No. 1969 - Lot Number 136 - Date Built 1902
Swindon’s solitary 0-4-0T was an engine of considerable interest. Built in June, 1902, but not taken into stock until a year later, No. 101 was an experimental side tank locomotive burning oil fuel on Holden’s system. It had outside cylinders 13in. diameter x 22in, stroke, with 4⅛ in. piston valves operated by outside valve gear of Joy’s type. The wheels were of 3ft. 8in, diameter on a wheelbase of 9ft. 0in.
Its original boiler, no particulars of which have hitherto been published, was most unusual. It had an inner firebox consisting of a firebrick-built chamber 4ft. 10in. long x 4ft. 9in. wide; this chamber, which was 3ft. 0in. high at the sides but arched to 3ft. 6in. at the centre, was opened out at the front to fit the tube area. The backplate carried two oil-burning nozzles 2ft. 6in. apart. The boiler barrel, measuring 8ft. 0in. x 5ft. 0in. and pitched at 7ft. 0in., contained 289 1 1/2 in. tubes in its lower half. The very large steam space thus created compensated for the absence of an outer firebox - for what looked like a Belpaire firebox casing was in fact a short square saddle tank for the oil fuel. A standard brass safety-valve cover was mounted on the centre of the barrel. The tubes had a heating surface of 907.83 sq. ft. to which 10.9 sq. ft. was added, presumably, by the backplate. The boiler pressure was 180 lb.
The furnace evidently soon proved to be too large, for in July, 1902, drawings were issued for alterations, in which the length of the firebox was reduced to 3ft. l??in. and the back narrowed to 3ft., with a single oil burner in the centre. At the same time the tanks were shortened at the front, probably for better weight distribution.
In 1903 No. 101 received a Lentz boiler. This type of boiler was originated by Gustav Lentz in Prussia in 1888. Designed to eliminate stays as far as possible, it consisted of a corrugated cylindrical firebox within a cylindrical casing and a tapered barrel. (The type was revived in the U.S.A. by Cornelius Vanderbilt in 1899, though the tapered barrel was not an essential feature of the Vanderbilt design. Some such boilers were used on the Lancashire & Yorkshire Railway).
The date of fitting of No. 101’s boiler is shown in the records as April, 1903, but the engine did not emerge from works with it until October. It was made in three rings with a dome on the middle ring. The front ring was coned from 4ft. 0⅞ in. to 4ft. 10⅞ in. The total length of the barrel was l3ft. 6⅝in., but the length between tube-plates was only 8ft., since what would in a normal boiler constitute the firebox casing was in this instance an integral part of the boiler barrel. Pop safety-valves of the rail motor type were placed over the rear end of the barrel. This boiler had a corrugated circular inner firebox with internal diameters of 2ft. 11in. and 3ft. 3in., which extended into the boiler, its total length being 5ft. 9in.
The fuel saddle tank was removed, 200 gallons of oil fuel being stored in the rear end of the side tanks. Nests of coiled springs replaced the former laminated type, while large circular spectacle glasses were added to the cab front.
After being out of service from June 1904 to May 1905, the engine emerged converted to coal burning and with a firegrate 3ft. 3in, long by 2ft. 8in. wide in the corrugated firebox. The cab back-plate was removed and a small bunker fitted. In this, its fourth and final condition, the dimensions (as recorded on 0-4-0 tank Diagram A) were :-
Cylinders Diameter 13”, Stroke 22”
Boiler Barrel 13’ 6⅝”
Pitch 6’ 7”
Firebox Length 5’ 4”??
Tubes Number ??“ 242, Diameter 1”??
Heating surface Total 825.18 square feet
Grate area 7.78 sq. ft
Boiler pressure 160 lb
Wheels 3’ 8”
Wheelbase 9’ 0”
Weights Leading coupled 13T 2 cwt
Driving coupled 15T 10 cwt
Tractive effort (85%) 11,492 lb
Tank capacity 500 gallons
Although Lot 136 shows it as intended for the Wrington Vale Light Railway, No. 101’s activities were confined to shunting at Swindon works. It was condemned in September, 1911, with a mileage of 36,458; its boiler survived it by a couple of years.
Sorry if there are some odd looking characters inserted - I prepared this seven years ago for the following thread:- http://www.rmweb.co.uk/forum/viewtopic.php?f=7&t=3470 and the various changes in server etc since have scrambled some of the characters - mainly punctuation.
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