Denver and Rio Grande Western Railroad Class M-67

Denver and Rio Grande Western Railroad Class M-67
Technical specifications
Serial number(s)	63307-63316
Manufacturer(s)	ALCO's Brooks Works
Build date	1922
Total produced	30
Classification	M-67
Wheel arrangement	4-8-2 "Mountain"
Rail gauge	4 ft 8+1⁄2 in (1,435 mm) Standard Gauge
Valve gear	Walschaerts
Cylinders	Two, Outside
Boiler pressure	210 psi (14.50 kPa)
Bore stroke	28 in x 30 in (711 mm x 762 mm)
Firegrate area	80.20 sq ft (7.45 m2)
Fuel type	Coal
Heating area	1333 sq ft (123.88 m2)
Performance figures
Tractive effort	62,661 lbf (279 kN)
Factor of adhesion	4.11
Service information
Running numbers	1501-1530
Disposition details
Preserved	None were preserved
Disposition	All Scrapped

The Denver and Rio Grande Western Railroad Class M-67 was a class of 4-8-2 "Mountain" steam locomotives with a total of 30 examples built by the American Locomotive Company's (ALCO) Brooks Works for the Denver and Rio Grande Western Railroad in 1922.

With 63-inch drivers, they developed 62,661 pounds of tractive force. Cylinder dimensions were 28x30 inches and boiler pressure was 210 p.s.i. They had 4667 square feet of evaporative heating surface and 1333 square feet of superheater surface, plus an 80-square-foot grate area. They had a locomotive weight of 377,000 pounds.

They were all retired from revenue service by 1955 and every single one of them were scrapped. Nos. 1511-1520 were modified with a booster engine on their trailing trucks and were re-designated as the class M-78, but they didn't last for very long and they were also scrapped, thus rendering the Class M-67 officially extinct.

Stock list

Image	Loco No.	Manufacturer	Status	Notes
frameless	1501	ALCO's Brooks Works	Scrapped
frameless	1502	ALCO's Brooks Works	Scrapped
	1503	ALCO's Brooks Works	Scrapped
	1504	ALCO's Brooks Works	Scrapped
	1505	ALCO's Brooks Works	Scrapped
	1506	ALCO's Brooks Works	Scrapped
	1507	ALCO's Brooks Works	Scrapped
	1508	ALCO's Brooks Works	Scrapped
	1509	ALCO's Brooks Works	Scrapped
	1510	ALCO's Brooks Works	Scrapped
	1511	ALCO's Brooks Works	Scrapped
	1512	ALCO's Brooks Works	Scrapped
	1513	ALCO's Brooks Works	Scrapped
frameless	1514	ALCO's Brooks Works	Scrapped
	1515	ALCO's Brooks Works	Scrapped
	1516	ALCO's Brooks Works	Scrapped
	1517	ALCO's Brooks Works	Scrapped
	1518	ALCO's Brooks Works	Scrapped
	1519	ALCO's Brooks Works	Scrapped
	1520	ALCO's Brooks Works	Scrapped
	1521	ALCO's Brooks Works	Scrapped
	1522	ALCO's Brooks Works	Scrapped
	1523	ALCO's Brooks Works	Scrapped
	1524	ALCO's Brooks Works	Scrapped
	1525	ALCO's Brooks Works	Scrapped
	1526	ALCO's Brooks Works	Scrapped
	1527	ALCO's Brooks Works	Scrapped
	1528	ALCO's Brooks Works	Scrapped
	1529	ALCO's Brooks Works	Scrapped
	1530	ALCO's Brooks Works	Scrapped

In 1922 the railway got 60 more M-67 4-8-2s but they were classified as M-67 X . The X meaning Extra, their numbering was from 2300 to 2359 built by Baldwin.

They had 72 inch drivers and a 210 psi boiler producing 98,550 lbf. During the time, the railway gave 4 of their M-67x's to the southern Pacific those being numbers 2300, 2302, 2309, and 2325.