B&O #5600 was designed and built by the Baltimore and Ohio Railroad's own Mount Clare Shops in May 1937.12
The rear set of cylinders were placed beside the firebox. This allowed the locomotive's wheelbase to remain the same. The space beside the firebox was hot and dirty, which caused premature cylinder wear, and the placement of the cylinders limited the size of the firebox.
These same problems occurred on the PRR Q1, which also placed the rear cylinders by the firebox. It was built by the B&O's own Mount Clare Shops in 1937; however, it had problems with the sizes of the cylinders facing the other direction.
In 1943, No. 5600 was retired from service. The locomotive was then cut up for scrap in 1950.3
Locomotive Cyclopedia of American Practice. Simmons-Boardman Publishing Corporation. 1938. pp. 205–206. https://www.google.com.au/books/edition/Locomotive_Cyclopedia_of_American_Practi/5CVSAQAAIAAJ?hl=en&gbpv=1&dq=Baltimore+and+Ohio+class+N-1&pg=PA205&printsec=frontcover ↩
Morrison (2018), p. 403 - Morrison, Tom (2018-07-24). The American Steam Locomotive in the Twentieth Century. McFarland. pp. 403–405. ISBN 978-1-4766-2793-9. https://www.google.com.au/books/edition/The_American_Steam_Locomotive_in_the_Twe/Ka9mDwAAQBAJ?hl=en&gbpv=1&dq=Baltimore+and+Ohio+class+N-1&pg=PA445&printsec=frontcover ↩
Morrison (2018), p. 405 - Morrison, Tom (2018-07-24). The American Steam Locomotive in the Twentieth Century. McFarland. pp. 403–405. ISBN 978-1-4766-2793-9. https://www.google.com.au/books/edition/The_American_Steam_Locomotive_in_the_Twe/Ka9mDwAAQBAJ?hl=en&gbpv=1&dq=Baltimore+and+Ohio+class+N-1&pg=PA445&printsec=frontcover ↩