Data from the Scientific American Supplement, No. 458, October 11, 1884, which is reproduced by Project Gutenberg at ftp://sailor.gutenberg.lib.md.us/gutenberg/1/1/6/4/11647/11647-8.txt, accessed 25 January 2007. Works numbers were 2221-2226.
Described as "excellent" by Glover (1967), this design -- produced by Neilson & Company -- had 107 sq ft of heating surface in its 5' 9" long firebox. Matthew Kirtley developed this 4-4-0. See William Kirtley's successor in Locobase 8969.
The history said that these were boat-train engines that worked the 78 miles from London to Dover in 1 hour 50 minutes. A letter in the 15 July 1905 issue from R R Surtees, late of the Chief Draughtsman's position at the L C & DR commented that in fact this class were "...originally designed for working the Kent Coast cheap fast trains to Margate, Ramsgate, &c." This was not an inconsequential service, he notes, as "...these trains werre timed very fast and the loads were very heavy."
Five years after the first group of locomotives went into service, the LCDR built at Longhedge four additional bogie express engines -- Class M1, road 175-178 -- of virtually identical design to the 157s. Then Dubs supplied 181-186 M2s in 1884 (works numbers 1828-1833). Longhedge would add two more to the M2 class as 179-180.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | M/M1/M2 |
| Locobase ID | 2995 |
| Railroad | London, Chatham, & Dover (SECR) |
| Country | Great Britain |
| Whyte | 4-4-0 |
| Number in Class | 6 |
| Road Numbers | 157-162+ / 616-621 |
| Gauge | Std |
| Number Built | 6 |
| Builder | Neilson & Co |
| Year | 1876 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.33 |
| Engine Wheelbase (ft / m) | 21.04 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.40 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 30,240 / 13,717 |
| Weight on Drivers (lbs / kg) | 59,360 / 26,925 |
| Engine Weight (lbs / kg) | 94,080 / 42,674 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2700 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 78 / 1981 |
| Boiler Pressure (psi / kPa) | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17.5" x 26" / 445x660 |
| Tractive Effort (lbs / kg) | 12,148 / 5510.25 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.89 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 200 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.50 |
| Firebox Area (sq ft / m2) | 107 / 9.94 |
| Grate Area (sq ft / m2) | 16.30 / 1.51 |
| Evaporative Heating Surface (sq ft / m2) | 1069 / 99.35 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1069 / 99.35 |
| Evaporative Heating Surface/Cylinder Volume | 147.69 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2282 |
| Same as above plus superheater percentage | 2282 |
| Same as above but substitute firebox area for grate area | 14,980 |
| Power L1 | 4033 |
| Power MT | 299.57 |