Class 1200 (Locobase 4892)

The first Pacifics built by Baldwin for the Atchison, Topeka & Santa Fe and described in a 1906 Baldwin catalogue, which is reproduced on http://www.railroadextra.com/blatsf.hmtl . Although delivered with 69" drivers, they soon were fitted with 79" wheels (although the photograph doesn't show how such large drivers could fit). The 1200s had inside piston valves and motion. All fireboxes had 29.5 sq ft in arch tubes contributing to total firebox heating surface.

See Locobase 8265 for the superheated update.

Retirements began in 1939 and continued until 1950.

Class 1200 - superheated (Locobase 8265)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

This entry is representative of the superheated 1200s, but not exhaustive. All fireboxes had 29.8 sq ft of arch tubes. But in addition to the 30-element, 23 1/2" cylinder, Baker-gear variant shown in the data, the Santa Fe also installed a 28-element superheater (and 174 small tubes vs the 171 of the current variant). At least 4 others (1200, 1212 1219, 1220) kept the inside Stephenson gear and the 22 1/2" cylinders originally supplied, but added a 30-element superheater.

In the late 1920s, 4 of this class -- 1207, 1210, 1214-1215 -- were rebuilt as 2-6-2 Prairies. Locobase wonders why a railroad would make that change.

In any event, the last of the 1200 class was retired in 1950.

Class 1226 (Locobase 4891)

Balanced-compound Pacifics built by Baldwin for the Atchison, Topeka & Santa Fe and described in a 1906 Baldwin catalogue, which is reproduced on http://www.railroadextra.com/blatsf.hmtl . Additional data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

These were among the first Pacifics to be supplied to the Santa Fe and had the same boilers as the earlier 1200-class simples. They are among the few Pacifics delivered as compounds. Many were never converted but some were simpled beginning in 1918. See Locobase 8266 to see the result of simpling and superheating this design.

Class 1226 - superheated (Locobase 8266)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

In most respects, this upgrade of the 1226 class was identical to that of the 30-element 1200 superheat modification. The differences stem from the later engine's 73" drivers, which increased the calculated tractive effort.

All fireboxes had 29.8 sq ft of arch tubes.

Class 1270 (Locobase 8267)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

This set of 20 small Pacifics was delivered in 1909-1910 and followed a series of relatively big-boilered 4-6-2s. Santa Fe's diagram describes the class as having a "Jacobs" superheater, but provides no information on its contribution to heating surface.

Some were later superheated; see Locobase 8268.

Class 1270 - superheated (Locobase 8268)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Locobase 8267 describes the original, saturated-steam 1270s as they entered service. Some time after 1910, the railroad put in the same 28-element superheater applied to some of the 1200 series. It seems to have been a relatively straightforward update for a class that stayed in service as long as any Pacific.

Retirements began in 1940 and were complete in 1951.

Class 1290 (Locobase 4209)

Sizable Pacifics profiled in Railroad Gazette (27 March 1908). Using the Baldwin smokebox heater at the front of the long, straight boiler encouraged the lower boiler pressure, although one has to suspect that 20' tube lengths must have meant that the superheater wasn't getting the hottest heat possible.. 13" piston valves were relatively generous for the time.

Retired in 1939-1952.

Class 1297 (Locobase 8269)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Locobase isn't sure but the diagram suggests that this class had Jacobs Shupert stayles fireboxes. Moreover, the data show a sizable superheater area - could this be a "Jacobs" superheater that was a preheater of sorts? Such a installation would explain the otherwise cryptic tube length, which is alone among Santa Fe engines in appearing to be expressed in inches (202 7/8").

Some of these were later superheated in a more conventional layout; see Locobase 8270.

Class 1297 - superheated (Locobase 8270)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Locobase 8269 shows the original saturated-steam Pacifics that came to the Santa Fe in 1910. It seems from the current diagram that the Santa Fe superheated the class while retaining the Jacobs Shupert firebox. On the other hand, they deleted the preheater and lengthened the boiler tubes by 3 feet.

One locomotive had a substantially modified firebox of 58 sq ft, but the Santa Fe diagram doesn't show any heating surface areas. The boiler had 20 ft 8 1/8" tubes and flues, 191 of the 2 1/4" small tube variety and 28 5 1/2" flues. The firebox heating surface included 28.8 sq ft in 4 arch tubes.

In that more-conventional configuration, the class operated for several decades. The first of the class retired in 1935, the last in 1950.

Class 1309 (Locobase 8271)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

The Santa Fe had a long-running interest in the Jacobs Shupert stayless firebox and installed it on several classes. Baldwin's 1912 description stands as well as any to outline its differences from a typical firebox: "The inside and outside shells of this firebox are each composed of a series of channel sections, which are bent to a horseshoe form. The usual stay-bolts are replaced by plates, which have openings cut in them to permit the free circulation of steam and water, and are riveted between the adjacent channels."

Here the installation was combined with a Buck-Jacobs superheater (which was located in the boiler barrel) and a 4-cylinder, balanced-compound layout. A more conventional Schmidt smokebox was installed beginning in 1922; See Locobase 8272.

Class 1309 - sh - 26 flues (Locobase 8272)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Although the Santa Fe kept the Jacobs Shupert firebox and the balanced-compound layout, not long after the 1309s entered service the railroad pulled out the Buck-Jacobs boiler superheater and replaced with a Schmidt smokebox system. Another version had 165 2 1/4" tubes and 28 5 1/2" flues of slightly shorter length. The firebox heating surface included 28.8 sq ft of arch tubes.

Class 1337 (Locobase 8273)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Sticking with the balanced-compound layout for its Pacifics, this large class of Pacifics was delivered with the Schmidt superheater. Firebox heating surface included 28 sq ft of arch tubes.

Most were simpled between 1922 and 1927.

Class 1398 (Locobase 8274)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

A 4-4-6-2 was an oddity on any railroad, although less so for one as adventurous in locomotive design as was the Santa Fe in the early 20th Century. Locobase 420 describes the articulated original and its short career. By 1915, even the AT & SF had to admit the experiment was a failure, so its shops converted one of the engines into 2 Pacifics. As 4-6-2, they were quite successful and operated for decades before being scrapped in 1948 and 1950.

Class 3400 (Locobase 124)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

50 engines in this class originally completed with 73" drivers, receiving 79" drivers in the 1920s. In the thirties, many were retrofitted with disc drivers, new, thicker main rods, feedwater heater. Retired in 1950-1955.

Class 3500 (Locobase 3174)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Firebox heating surface included 29.5 sq ft of firebrick tubes.

35 engines in the class. Data in this entry is for these engines as four-cylinder balanced compounds. See 451 for simpled rebuilds.

Class 3500 - simpled (Locobase 451)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Firebox heating surface included 29 sq ft of firebrick tubes. Locobase 3174 shows the four-cylinder balanced compounds that entered service in 1914. These were simpled a few years later as shown in the current entry. Interestingly, about the only change was the deletion of two cylinders and the replacement of the HP cylinders with these larger-diameter jugs.

Retired in 1940-1955.

Class 3600 (Locobase 123)

One example built for the 1915 San Francisco exposition. The boiler is considerably bigger than earlier Santa Fe Pacifics, as is the grate area. Retired in 1938.