[1] The Chesapeake and Ohio Railway (C&O), which was in search of larger locomotives, allowed for the A-1 to be tested in their Allegheny Subdivision, and while impressed with the A-1’s performance, the C&O opted to wait for reviews from other railroads before placing their own orders.

[1][2] By that time, the C&O was operating under control of the Van Sweringen brothers, who formed the Advisory Mechanical Committee (AMC) to standardize all of their railroad subsidiaries.

[1] In 1930, the C&O ordered the first of forty 2-10-4 "Texas"-types from Lima, which they classified as the T-1 class, and they shared identical design features with the Erie’s 2-8-4s.

Despite their overall success, their long-wheelbase made it difficult to maintain a proper counterbalancing scheme as the drivers wore unevenly in service.

Later in their careers, as their built up frames began to work loose, the T-1s rode roughly and pounded the track to the point that a special gang stood by at the bottom of one long grade to repair the damage.