[2] The consolidations were solely used for heavy freight service on the RDG's branch lines, as well as the mainline on occasion.

[2] Several critical and minor parts from the original I-10sa's were salvaged and reused for construction of the new T-1 locomotives, including all the boilers, most of the Wootten fireboxes, the grate rigging, the air pumps, the water gauges, the safety valves, the headlights, the whistles, and the bells.

[2] Baldwin supplied various new components to the RDG's locomotive shops, including the 70-inch (1,800 mm) driving wheels and various extension parts used to expand the boilers of the new T-1's.

2120-2124 were equipped with steam heating for this purpose; cab signals were also applied to some locomotives for use on the Bethlehem Branch in 1948.

2124 pulled the RDG's first Ramble train on October 25, 1959, from Wayne Junction in Philadelphia to Shamokin, Pennsylvania, and 950 passengers were on board that day.

[9] Since 1960, the RDG had begun to run into financial troubles, and since maintenance on the T-1's were becoming expensive, the railroad had to discontinue the Iron Horse Rambles.

[13] It spent almost a decade in the firm's scrapyard until 1975, when it was purchased along with sister 2101 by Ross Rowland to be used as a source of spare parts for the former for his American Freedom Train.

[14] They only used 2100 to run on the Whinchester and Western before it was eventually donated to the Portage Area Regional Transportation Authority, who in turn put it up for auction.

Jerry Jacobson, who briefly test ran it on his Ohio Central Railroad, placed a bid on the locomotive, but he lost in 1998 to Thomas Payne.

[15] Payne moved 2100 to the former New York Central's St. Thomas, Ontario, Canada, shop, where it was converted to burn oil, with plans to use the locomotive to pull excursions throughout the Rocky Mountains.

In 2015, 2100 was leased to the American Steam Railroad Preservation Association and moved to the former B&O roundhouse in Cleveland, Ohio where it is presently being restored to operating condition.

It spent almost a decade in the firm's scrapyard until 1975, when it was purchased along with sister 2100 by Ross Rowland for use on his upcoming American Freedom Train, and subsequently renumbered to AFT 1.

The Chessie System arranged a deal with Rowland and traded their Chesapeake and Ohio 614 for the 2101, which was cosmetically restored as AFT 1 for static display at the B&O Railroad Museum in Baltimore.

2102 was sold to Bill Benson of Steam Tours of Akron, Ohio in 1966 and spent the next 23 years running on various fan trips in the Northeast, Mid-Atlantic and Midwest and made a brief appearance on the Greenbrier Scenic Railroad running between Durbin and Cass, West Virginia.

2102 spent the next six years pulling tourist trains on the BM&R as well as occasional off-line trips until its flue time expired in 1991.

2102 was fired up for the first time in 30 years in January, 2021, and on April 6, 2022, the locomotive made its first test runs, restored to the black and yellow Iron Horse Rambles livery with Reading & Northern lettering.

The 2102 made its excursion debut on May 28, 2022, hauling a 19 coach Iron Horse Rambles excursion between Reading Outer Station and Jim Thorpe, Pennsylvania.2124, an all-roller-bearing-equipped locomotive, was purchased by New England seafood magnate and steam locomotive collector F. Nelson Blount in 1962 for static display at his Steamtown, U.S.A. museum in North Walpole, New Hampshire.