Class G1-19 (Locobase 9018)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers 2234-2235. Iowa Central info from http://www.cashgroth.com/iacent.html, accessed 1 January 2008. Works #1203-1204.

Known as the "Hook & Eye", the Iowa Central "...was said to have poor equipment and a high turnover of men", according to Lyndon "Cash" Groth, webmaster of the Minneapolis & St. Louis - Iowa Central - Chicago & Northwestern Website (http://www.cashgroth.com/).

Class G2-20 (Locobase 9019)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers 2234-2235. Iowa Central info from http://www.cashgroth.com/iacent.html, accessed 1 January 2008. Works #1761-1766.

Six years after the quartet of Pittsburgh Ten-wheelers shown in Locobase 9018 arrived in Iowa, the Hook & Eye returned to the builder for this group of six. Although not significantly bigger in the boiler, the engine had a bigger grate and 18" x 26" cylinders. At some later date, the IaC bushed the cylinders to a 17" diameter. They were followed in the next year by much larger engines; see Locobase 9021.

Most of this class was retired in 1931.

Class G3-22 (Locobase 9021)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers 2234-2235. Iowa Central info from http://www.cashgroth.com/iacent.html, accessed 1 January 2008. Works #1881-1884.

Pittsburgh sent four more engines to the Iowa Central the year after it delivered the 101s. In the interim, the entire design grew considerably. The boiler had more tubes, the grate grew, the drivers were taller and carried more weight ...this was a different design for a different service. Only firebox heating surface remained nearly the same and it included 18 sq ft of arch tubes. Steam was now admitted through 10"-diameter piston valves.

Class G4-25 (Locobase 9022)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers 2234-2235. Iowa Central info from http://www.cashgroth.com/iacent.html, accessed 1 January 2008. Works #1300-1303.

A year after Pittsburgh supplied the IaC with some freight-friendly Ten-wheelers (Locobase 9018), it produced a second quartet with even smaller drivers, slightly more boiler pressure and cylinder volume and, consequently, more tractive effort. The much larger grate allowed more steam to be generated and the firebox heating surface area included 13 sq ft of arch tubes.

The class remained essentially unchanged until their retirements in September 1931 (204), April 1935 (205-206), and November 1936 (207).

Class G5-25 (Locobase 9023)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers 2234-2235. Iowa Central info from http://www.cashgroth.com/iacent.html, accessed 1 January 2008. Works #2505-2508.

The Hook & Eye adopted 4-6-0s for all kinds of service from drag freight to passenger. This quartet from the small Paterson, NJ builder that would soon join several others in the American Locomotive Corporation were mixed-traffic engines of modest size. They did use 8" piston valves and their firebox heating surface areas included 12 sq ft of arch tubes each.

Like most of the rest, they served the IaC and its successor Minneapolis & St Louis until the early-to-mid thirties.

Class G6-24 (Locobase 9024)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Superheater area is an estimate based on similar locomotives with identical setups.

These were among the latest Ten-wheelers to be built for a North American road (although there were several large classes completed later). Their cylinders were supplied through 8" piston valves and the firebox heating surface included 25 sq ft of arch tubes.

The class remained in service until after World War II, with some retiring in 1946, others lasting until 1950.

Class G7-24 (Locobase 9025)

Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers 2234-2235. Iowa Central info from http://www.cashgroth.com/iacent.html, accessed 1 January 2008. Works #2505-2508.

In the same year that the IaC bought mixed-traffic Ten-wheelers from Cooke (Locobase 9023), they purchased this sextet from Baldwin. The design was a bit bigger and the Stephenson gear operated 8" piston valves, but the firebox heating surface area included only a modest 13 sq ft of surface area.